Oilfield Co.

Daqing, China

Oilfield Co.

Daqing, China
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Lu B.-L.,Jilin University | Sun X.,Jilin University | Zhang G.-C.,China National Offshore Oil Corporation | Zhang B.,Jilin University | And 3 more authors.
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2011

We selected 18 outcrop sections along the southeastern coast and acquired 245 rock samples which may occur in South China Sea Basin basement. Their density and magnetic susceptibility are measured and the density-magnetic susceptibility crossplot is established that is used to constrain the geological interpretation of seismic profiles through wells and potential anomalies. Then, we have summarized the seismic-potential field response characteristics of basement rocks, which contain volcanic rock, intrusive rock, metamorphic rock and sedimentary rock, in 4 categories and 11 sub-categories in the northern South China Sea Basin. Application of the geological-geophysical interpretation model to each main profile in South China Sea Basin, the basin basement lithology mapping is well achieved. So, this method, from the section of basin margin to the inner basin and from the measure of rock density and magnetic susceptibility to the.

Wang P.-J.,Jilin University | Zhang G.-C.,China National Offshore Oil Corporation | Meng Q.-A.,Oilfield Co. | Lu B.-L.,Jilin University | And 2 more authors.
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2011

Materials comprising volcanogenic successions are derived from erupted components and transported by lava/pyroclastic flows and fallout as well as reworking processes. Their buildups are substaintial allostratigraphy and quite different from all kind of sedimentary sequences. The same with sequence stratigraphy for sedimentary rocks, volcanostratigraphy focuses on filling patterns confined by sequence boundaries, and depicts geological features and correlation of the successions in a volcanic basin. Some volcanic seismic facies units, including inner seaward dipping reflectors (SDR), landward flows, outer high and feeder dikes, were recognized in northern margin of the South China Sea based on the concepts of seismic volcanostratigraphy, indicating volcanic rifted margin. For volcanogenic successions of the Songliao Basin, it was realized that there are three types of sequence boundaries, in descending order of formation, member, and volcanic cycle, and that there are five patterns of basin filling i. e. aggradation, progradation, draping, mounding and cutting.

Wang P.,Jilin University | Chen S.,Oilfield Co.
AAPG Bulletin | Year: 2015

Major reservoirs in the Songliao Basin (SB) are composed of volcanic rocks below 3000 m (9843 ft) of buried depth. Gas accumulations are mostly found in the buried volcanic highs, which in general correspond to paleovolcanic centers. Porosity in the volcanic rocks depends on both primary and secondary processes. The best porosity is preferentially developed in a proximal facies near the central part of each volcanic edifice. Porosity and permeability decrease with depth of burial for both volcanic and non-volcanic sections, but their porosity-depth trends differ. Lava and welded ignimbrite slowly lose porosity with burial depth because they solidified by cooling, and their groundmasses (≥75%) are poor in quartz and calcite precipitation, thus preserving porous space. In contrast, the associated sandstone, conglomerate, tuff, and tuffite are more sensitive to overburden pressure, suffering more intense compaction and cementation. As a result, porosity and permeability of lava and ignimbrite exceed that of the other rocks, and thus, they are the best reservoir rocks below burial depths of ca. 3000 m (9843 ft) in the SB. The paleovolcanic domes are rich in both lava rocks and fractures of diverse origin, and the topographic highs provide favorable locations for gas migration and accumulation. Copyright © 2015. The American Association of Petroleum Geologists. All rights reserved.

Lang Y.-Q.,Jilin University | Hu D.-Q.,Jilin University | Liu C.,Beijing Forestry University | Zhang B.,Jilin University | And 3 more authors.
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2011

On the basis of 2517 series of field measured data, bulk magnetic susceptibility values of 245 rock samples, detailed rock-mineral identification and total silicate analysis, combining with single mineral magnetic susceptibility and comparison research of each rock, we found that.

Zhang L.,CAS Institute of Geology and Geophysics | Zhang L.,Oilfield Co. | Luo X.,Chinese Academy of Sciences | Liao Q.,Oilfield Co. | And 9 more authors.
AAPG Bulletin | Year: 2010

Hydraulic behaviors of faults in sedimentary basins have been paid close attention in studies of hydrocarbon migration and accumulation because of their important functions in basin hydraulic circulations. In previous studies, however, the function of faults in hydrocarbon migration is characterized by the sealing capacity of faults. In fact, sealing is only an impressive and time-dependent aspect of the hydraulic behavior of faults, which may act as seals during some periods and as pathways some time later. Therefore, in hydrocarbon migration studies, sealing indices may successfully be used in some cases but not in others. In this article, we introduce an empirical method (termed the fault-connectivity probability method) for assessing the hydraulic connecting capacity of a fault for hydrocarbon migration over geological time scales. The method is based on the recognition that observable hydrocarbon in reservoirs should result from the opening and closing behavior of the fault during the entire process of hydrocarbon migration. In practice, the cumulative petroleum migration through a segment of the fault zone is identified by the presence (or not) of hydrocarbon-bearing layers on both sides of the segment. Data from the Chengbei step-fault zone (CSFZ) in the Qikou depression, Bohai Bay Basin, northeast China, were used to develop this method. Fluid pressure in mudstones, normal stress perpendicular to fault plane, and shale gouge ratio are identified as the key factors representing fault-seal capacity. They are combined to define a nondimensional fault opening index (FOI). The values of FOI are calculated from the measured values of the key factors, and the relationship between FOI and fault-connectivity probability on any fault segment is established through statistical analysis. Based on the data from the CSFZ, when the FOI is less than 0.75, the fault-connectivity probability is 0; when FOI ranges from 0.75 to 3.25, the corresponding fault-connectivity probability increases from 0 to 1 following a quadratic polynomial relationship; when FOI is greater than 3.25, the fault-connectivity probability is 1. The values of fault-connectivity probability can be contoured on a fault plane to characterize the variations of hydraulic connective capacity on the fault plane. The applicability of this concept for other oil fields (in particular, the quantitative relationship between FOI and fault-connectivity probability) has still to be ascertained. Copyright © 2010. The American Association of Petroleum Geologists. All rights reserved.

Zhang F.-B.,Oilfield Incorporated Company | Yang Y.-X.,Oilfield Incorporated Company
Northwestern Geology | Year: 2012

The characteristics of petrochemistries, microelements and rare earth elements of sandstone samples from Chang9-10 members of Yanchang Formation of lingl well are systematically studied. By using structural distinguished figures of different macroelements and microelements, the source area structural attributes of lingl well are analyzed and discussed. The results show that; The microelement content in sandstone samples of Yanchang Formation from lingl well area is stable; In microelement distribution curves, light rare earth elements (LREE) are evidently concentrated but heavy rare earth elements (HREE) are depleted; According to the structural distinguished figures of different macroelements and microelements, the structural backgrounds of source area are mainly active continental margin and islands; The Lingl well area is located in hinterland in Odors basin, its sediments are mixed provenance, and its evolution course is controlled by Qinling orogenis belt which results from combination Huabei plate with Yangtze plate. To late Triassic, Qinling orogenis belt became stable source area of Lingl well.

Zeng B.Y.,Northeast Petroleum University | Ma S.Z.,Northeast Petroleum University | Wang W.G.,Northeast Petroleum University | Cheng J.Y.,Oilfield Ltd Company
Advanced Materials Research | Year: 2014

The distribution of oil and water in Xinmiaoxi-Xinbei area Fuyu reservoir is very complicated and the variation of productivity is very large The distribution on the whole is continuous,but there are special hydrocarbon accumulation characteristics that lower place oiliness but high location multi-water From the six major geological factors: source, reservoir and cap rock, trap, migration,and preservation condition, synthetically considering the distribution of mature source rock, underwater distributary channel's distribution, the matching relation of fault and sand, single trap and inherited palaeostructure, combined with the distribution regular of reservoir to study the enrichment regularity of research Finally find that this research area has a accumulate characteristics, that is, ancient tectonic controlled potential, the single trap reservoir control the reservoir, lithology control boundary, single sand bodies control layer Among these, the high ancient structure formed before the peak of hydrocarbon expulsion is the advantage point oil and gas migration, is also the main control factors of continuous distribution of oil and gas; Single trap is the main controlling factor of the complex oil-water distribution that high position is water and low position is oil, and then we can determine the cause of the complex regularities of oil-water distribution. © (2014) Trans Tech Publications, Switzerland.

Li G.,CAS Shenyang Institute of Applied Ecology | Guo S.,CAS Shenyang Institute of Applied Ecology | Wang S.,CAS Shenyang Institute of Applied Ecology | Lu B.,Oilfield Ltd Company
Petroleum Science and Technology | Year: 2014

An aged emulsion from polymer flooding was dewatered using demulsification and centrifugal separation, and factors of influence on electrical dehydration were investigated. The lowest moisture (0.12%) was achieved at 16000 rpm separated separation. In recycled oil, there were significantly decreases in content of nitrogen, impurities, and iron. The results of simulative electrical dehydration showed that a small amount of separated wastewater (10%) could increase current continually. However, the recycled oil can achieve a satisfactory result of dehydration even mixed with 30% wastewater. It indicated that polymer, impurities, resins, and asphaltene contributed to the electric field collapse of the electric dehydrator. © 2014 Taylor & Francis Group, LLC.

Chen S.-M.,Oilfield Co. | Zhang Y.-G.,Oilfield Co. | Jiang C.-J.,Oilfield Co.
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2011

With the deepening of exploration and development, volcanic gas shows the feature separate reservoir of volcanic edifice. The non-homogeneous characteristics of volcanic formation are obvious. For meeting the need of meticulous study of exploration and development, improving the level of volcanic gas reservoir comprehensive study and achieving a understanding, in the Xujiaweizi depression dense well pattern-three dimensional seismic area of Songliao basin, the authors research the seismic volcanic edifice anatomy under geological prior model constraint. Three kinds of volcanic edifices can be identified as layered, dome, and funnel-shaped. The overlying mode is in three kinds of shoestring, superimposed mosaic type. Volcanic edifice type and overlying mode are controlled by fault systems.

Li C.-L.,Oilfield Co. | Cu R.-H.,Oilfield Co. | Liu Y.-Z.,Eastern China Geological and Mining Organization for Nan ferrous Metals in Jiangsu Province
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2011

Estimating the basement lithology of basin not oniy is significant for investigating deep geological structure and evolution of basin, but also has instructive role to exploration of the matrix weathering crust reservoir. On the basis of comprehensively analyzing the cause of gravity and magnetic anomalies of basin, in this paper a series of processing and interpretation methods and techniques of integrated geophysical data for estimating the basement lithology were introduced. The formation-separating technique constrained by the seismic structural interface with gravity data can acquire the gravity anomalies caused by basement lithology.

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