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Liu H.,Exploration and Development Research Institute of Daqing Oil Field Co.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2017

In order to perfect the mechanism of alkaline-surfactant-polymer (ASP) flooding, the dilational properties of NaOH-HABS-HPAM system were studied by interfacial dilational rheology method. The relationship between interfacial dilational properties and emulsions, interfacial tension and oil displacement efficiency of NaOH-HABS-HPAM system were analyzed. The results showed that interfacial dilational modulus of the ASP system increased and its phase angle decreased with the increase of frequency. At high frequency, the interfacial dilational modulus of HABS-HPAM system was larger than that of NaOH-HABS-HPAM system, while which was higher than that of HABS. For the phase angle, HABS-HPAM system has a negative value, HABS has the largest value, while NaOH-HABS-HPAM system has the value lower than NaOH-HABS system, indicating that the elasticity of interface NaOH-HABS-HPAM system was better than other systems. The interface dilational modulus has direct proportion relationship with emulsification time, emulsification rate and emulsion stability, interfacial tension balance time of NaOH-HABS-HPAM, but there is no relevance between the interface dilational modulus and interfacial tension, injection pressure and enhancement of oil recovery. © 2017, Editorial Office of Acta Petrolei Sinica(Petroleum Processing Section). All right reserved.

Mo W.-L.,Peking University | Mo W.-L.,Petrochina | Wu C.-D.,Peking University | Zhang S.,Exploration and Development Research Institute of Daqing Oil Field Co.
Natural Gas Geoscience | Year: 2013

Songliao Basin is a large-scale Mesozoic continental petroliferous basin. Based on analysis of high-resolution 3D seismic data, a large-scale sediment gravity flow channel system is identified in the Member 1 of Nenjiang Formation, and multiple sets of slip blocks are identified in the Member 2-3 of Nenjiang Formation in the north Songliao Basin. It indicates that this channel system resulted from the rushing of river into lake, and the 3 slip blocks resulted from gravity slumping of delta front sediment due to its great slope gradient, which will be transported by the earthquake or flood. It has extremely important meaning to hydrocarbon reservoirs within lacustrine mudstones of large-scale depression-lacustrine basin that we have made clear about the generation mechanism of sediment gravity flow in the Nenjiang Formation in the Songliao Basin.

Chen S.,University of Science and Technology of China | Jian G.,Beijing Petroleum and Oil Institute | Hou Q.,Beijing Petroleum and Oil Institute | Gao S.,Exploration and Development Research Institute of Daqing Oil Field Company | And 3 more authors.
International Journal of Oil, Gas and Coal Technology | Year: 2013

The enhanced oil recovery (EOR) results of foam flooding depend largely on the stability of foam flow within reservoirs in the presence of crude oil. Experimental studies indicated that oil would impact the foam stability greatly. This paper discussed the effect of oil on the stability of polymer enhanced foams. Two commercial polymers including hydrolysed polyacrylamide (HPAM) and modified polyacrylamide (MPAM) were employed. Mechanism on interaction between foam and oil for experimental foam systems was also studied quantitatively based on several physical-chemical parameters including spreading coefficient, entering coefficient, bridging coefficient and lamella number. The foam stability could be remarkably improved with both HPAM and MPAM. The effect of oil on the stability of polymer enhanced foams could not be fully understood by related coefficient theories. The increase in viscoelasticity of foam films would play a key role in the stability improvement for polymer enhanced foams. Copyright © 2013 Inderscience Enterprises Ltd.

Qu H.,China University of Geosciences | Xi D.,China University of Geosciences | Xi D.,CAS Nanjing Institute of Geology and Palaeontology | Li S.,CAS Nanjing Institute of Geology and Palaeontology | And 3 more authors.
Journal of Paleontology | Year: 2014

Cretaceous non-marine deposits are widespread in China and have been studied comprehensively. The Songliao Basin in northeast China is thought to be well suited for investigation of Cretaceous biostratigraphy. However, despite much research having been conducted in the basin, little is known about its Late Cretaceous biostratigraphy and paleoenvironment. Here, we establish a high-resolution biostratigraphy of the Late Cretaceous based on ostracods from borehole SK1(n) in the Songliao Basin, northeast China. As part of the present study, 45 species assigned to 20 genera have been recovered, with one new species (Ilyocypris bisulcata n. sp.) and five ostracod assemblages: the Cypridea gunsulinensis-Mongolocypris magna assemblage, which is marked by the first occurrence (F.O.) of Ilyocyprimorpha with nodes and spines; the Ilyocyprimorpha-Limnocypridea sunliaonensis-Periacanthella assemblage, which ranges from the F.O. of Ilyocyprimorpha with nodes and spines to the F.O. of Strumosia sp.; the Strumosia inandita assemblage from the F.O. of Strumosia sp. to the lower occurrence (L.O.) of Strumosia inandita; the Talicypridea amoena-Metacypris kaitunensis-Ziziphocypris simakovi assemblage from the F.O. of Mongolocypris apiculata (Cea) and Talicypridea amoena to the F.O. of Ilyocypris sp.; and the Ilyocypris assemblage from the F.O. of Ilyocypris sp. to the L.O. of Ilyocypris bisulcata n. sp. Moreover, the zonal fossil Ilyocypris bisulcata n. sp. of Zone 5 is here described for the first time from the upper Mingshui Formation, and Paleocene charophyte genera including Neochara and Grovesicahra have been found to coexist with the Zone 5 fauna. The age of the Ilyocypris Assemblage is assigned to the latest Maastrichtian to the earliest Danian. Copyright © 2014, The Paleontological Society.

Shi Y.,Northeast Petroleum University | Wang W.-H.,Exploration and Development Research Institute of Daqing Oil field Co. | Li Y.,Northeast Petroleum University | Jing H.-L.,Northeast Petroleum University
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2013

Compare with the traditional 2D surface-related multiple prediction algorithm, 3D surface-related multiple prediction approach based on wave equation needs no assumption for underground medium. It is a powerful tool to deal with multiple prediction problem in seismic data processing, which is more conform to the actual situation that seismic wave propagate through the underground medium. Based on the fundamentals of multiple prediction, the matrix representation, calculation approach and realization condition for full 3D surface-related multiple prediction are proposed in this paper. Also using GPU (Graphic Processing Unit) to accelerate full 3D surface-related multiple prediction algorithm, compare to traditional CPU computation, the speed is 165 times faster. Multiple prediction tests are done on synthetic 3D seismic data with surface-related multiples, 2D and 3D surface-related multiple prediction effect from 2D and 3D algorithms are compared and analyzed, and the result demonstrates that full 3D surface-related multiple prediction approach based on wave equation has higher computation accuracy and better prediction effect than 2D algorithm. With the help of reasonable adaptive subtraction, we can obtain seismic prospecting data with high precision after surface-related multiple suppression.

Shi Y.,Northeast Petroleum University | Wang W.-H.,Exploration and Development Research Institute of Daqing Oil field Co.
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2012

Surface-related multiple suppression method based on wave equation prediction can handle seismic data from complex subsurface, but the computational cost is high. For filter-based multiple suppression method, its computation efficiency is high, but it is only limited to the seismic data which has enough moveout difference between the primary and multiple. It is difficult to obtain satisfactory suppression effect for the seismic data from complex media, such as velocity reversal. The proposed algorithm combines wave equation prediction with filtering method effectively, surface-related multiple is predicted approximately by the collaborative parallel acceleration calculation from GPU(graphic processing unit) and CPU, followed by comparing and analyzing original data and predicted multiple in the hyperbolic Radon domain. We design an effective adaptive Butterworth-type filter to select the multiple energy from original data in Radon domain. After inverse Radon transform, suppression result can be obtained by subtracting multiple from original data with multiple. The theoretical single-shot data, complex SMAART model and field data are tested by the proposed algorithm. The results demonstrate that the multiple suppression method in the article can breakthrough the limitations of wave equation based method and hyperbolic Radon transform effectively, which can suppress surface-related multiples from complex subsurface efficiently and accurately.

Wan X.,China University of Geosciences | Zhao J.,China University of Geosciences | Scott R.W.,University of Tulsa | Wang P.,Jilin University | And 3 more authors.
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2013

The Songliao Basin is the largest Cretaceous oil and gas-producing lacustrine basin in China, with its greatest aerial extent in the middle Cretaceous. A coring program (SK1) has to date yielded 2485.89m of continuous core (96.46% recovery) and provides significant material for Cretaceous research. The sequence of the core consists mainly of lacustrine sandstone, dark grey mudstone, shale and oil-shale. The Upper Cretaceous stratigraphic section has been subdivided into the Quantou, Qingshankou, Yaojia, Nenjiang, Sifangtai and Mingshui formations in ascending order. Late Cretaceous microfossils are diverse and abundant. A detailed biostratigraphic study has subdivided the sequence into high precision biozones: 21 ostracode assemblages, 10 phytoplankton assemblages, 7 palynological zones and 4 charophyta assemblages, respectively. In addition, marine foraminifera were first discovered from the basin. Three 206Pb/238U ages and one 40Ar/39Ar age were analysed. Ten local magnetozones have been recognised in the SK1 (North), and two magnetozones have been indicated in the SK1 (South). Based on biostratigraphy, high-resolution magnetostratigraphy and SIMS U-Pb zircon analyses, the SK1 stratigraphy is correlated with Upper Cretaceous stages in the International Geologic Time Scale. The upper part of the Quantou Formation is the lower Turonian; the Qingshankou Formation is the upper Turonian-lower Coniacian; the Yaojia Formation is from the upper Coniacian to middle Santonian; the Nenjiang Formation is the upper Santonian to middle Campanian; the Sifangtai Formation is limited to the upper Campanian; and the Mingshui Formation is the uppermost Campanian to Maastrichtian. It is likely that the upper part of the Mingshui Formation belongs to the Paleocene, and the K/Pg boundary is within the Member 2 of the Mingshui Formation around the depth of 328m by new micropalaeontologic and magnetostratigraphic data. © 2012 Elsevier B.V.

Xi D.,China University of Geosciences | Xi D.,CAS Nanjing Institute of Geology and Palaeontology | Cao W.,China University of Geosciences | Huang Q.,Exploration and Development Research Institute of Daqing Oil Field Corporation | And 8 more authors.
Cretaceous Research | Year: 2016

The Songliao Basin is the largest non-marine oil-bearing basin in China. Because of the absence of substantial evidence, the hypothesis of seawater incursion events into the Songliao Basin remains controversial. The presence of marine fossils could provide direct proof to support this supposition. Here, we report new discoveries of foraminifera, calcareous nannofossils, brackish dinoflagellates, and other marine and brackish-water fossils to support the suggestion of seawater incursion events in the Songliao Basin. Relatively abundant benthic and planktonic foraminifera, calcareous nannofossils, marine and brackish-water dinoflagellates, fish, and bivalves have been discovered in Members 1 and 2 of the Nenjiang Formation, a few foraminifera and brackish-water dinoflagellates have been found in the lower Qingshankou Formation, and just a few brackish-water bivalves have been found in the uppermost Qingshankou Fm. Based on the presence of marine molecular fossils and other evidence, we suggest that relatively large seawater incursion events occurred during the sedimentation of the lower Nenjiang Fm., relatively smaller seawater incursions occurred during the deposition of the lower Qingshankou Fm., and possibly a very small seawater incursion occurred during the sedimentation of the uppermost Qingshankou Fm. These seawater incursion events in the Songliao Basin were controlled by regional tectonic activity, evolution of the palaeo Songliao Lake, and global sea level change. These periodic seawater incursions brought marine biota into the palaeo Songliao Lake. © 2015 Elsevier Ltd.

Chu Y.,Exploration and Development Research Institute of Daqing Oil Field Co. | Wu X.,Exploration and Development Research Institute of Daqing Oil Field Co. | Li J.,Exploration and Development Research Institute of Daqing Oil Field Co. | Yao S.,Exploration and Development Research Institute of Daqing Oil Field Co. | And 2 more authors.
Oilfield Chemistry | Year: 2016

In order to discover the reason of stable emulsion with high viscosity from ASP production well, on the basis of analyzing oil phase viscosity difference from core and production well, the affecting factors of emulsion stability and viscosity were investigated by changing stirring rate and chemical type and concentration and water cut and petroleum composition. In addition, the related mechanism was discussed. The results showed that high viscosity emulsion was formed by mixing produced water with ultra-low concentration chemical agents and crude oil using strong acting force (stirring rate of homogenizer <6000 r/min) at certain water cut (≤50%) , and asphaltene in crude oil was the key factor to the formation of stable emulsion with high viscosity. When chemical agents(heavy alkyl benzene sulfonate, alkali or HPAM) with low concentration were added in the simulated formation water, the viscosity of crude oil-water emulsion, prepared at water cut of 50% and at the stirring rate of 11000 r/min, was over 100 mPa's and phase separation didnont appear after 90 days-however, the addition of chemical agents with high concentration in the simulated formation water was unfavourable for the formation of high viscosity emulsion , and viscosity of emulsion was less than 100 mPa's and water separating proportion was over 85% after 7 days, which was mainly because that the added heavy alkyl benzene sulfonate and HPAM mainly played the role of de-emulsifier.

Song Z.,CAS Guangzhou Institute of Geochemistry | Qin Y.,CAS Guangzhou Institute of Geochemistry | Qin Y.,University of Chinese Academy of Sciences | George S.C.,Macquarie University | And 3 more authors.
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2013

The abundance and composition of total organic carbon, aliphatic and aromatic hydrocarbons including biomarkers, and the δ13C composition of total organic matter and individual compounds in core samples of the Nenjiang Formation from the SK-1 borehole of the Songliao Basin provide information on the paleoenvironmental conditions of lacustrine sediments formed during the Upper Cretaceous. The distribution of n-alkanes, and their δ13C composition, and 4-methylsteranes and dinosteranes in the first member of the Nenjiang Formation (K2n1) indicate that the organic matter largely originated from algal organisms and is dominated by types I and II kerogen. The occurrence of gammacerane, aryl isoprenoids isorenieratane and low pristane/phytane and diasterane/sterane ratios further suggest a salinity stratified water column associated with anoxic bottom waters, as well as possible photic zone oxygen depletion conditions during major source rock deposition of the K2n1. The organic geochemical data also indicate significantly different depositional environments for the second member of the Nenjiang Formation (K2n2) sediments, which are interpreted to have been deposited under a uniform salinity (non-stratified) oxic water column. Consequently, although the organic matter in the K2n2 sediments was largely derived from algal and bacterial sources, the kerogen types are dominantly IIb and III due to the oxidative degradation of organic matter, combined with a gradual increase in land-plant input. Furthermore, the occurrence and shift of two saw-toothed distribution patterns of the δ13C composition of C29 to C33 n-alkanes, with "W" and "M" patterns being isotopically heavy odd- and even-numbered alkanes, respectively, is suggestive of organic input shift or an unknown mechanism of carbon uptake or isotopic fractionation. In particular, the heavy even carbon numbered high molecular weight n-alkanes is rare and needs further investigation. © 2012 Elsevier B.V.

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