Time filter

Source Type

Lang X.-J.,Shandong University of Science and Technology | Yu J.-F.,Shandong University of Science and Technology | Yu J.-F.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Fu W.-Z.,Shandong University of Science and Technology | And 2 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

Chegu29 wells which distributed from southwest to northeast were selected for the study of Milankovitch cycle. With the help of Matlab software and Wavelet transform toolbox and on the basis of the previously constructed recognition method of Milankovitch cycle, cycles identified from logging data of seven wells were selected and then the dominant Milankovitch cycles recorded in strata were determined. The development regularity of Milankovitch cycle and the development characteristic of delta and basin were revealed, the age of strata was calibrated by the analysis of sedimentary rate and depositional thickness. It is found that Milankovitch cycles are widely developed in Chezhen Sag. The development of the low-frequency informations is inferior to the high-frequency ones. The delta and basin exhibit difference of expansion-shrinking-expansion from southwest to northeast, the relatively low-frequency cycles(Eccentricity) are prone to be preserved in the stratum whose sedimentary rate is lower, the high-frequency ones(Precession, Obliquity)are prone to be preserved in the stratum whose sedimentary rate is higher. According to calculation, the age of top boundary of the Member 1 of Shahejie Formation ranges from 31.5 to 32.5 Ma, and the age of top boundary of the Member 2 of Shahejie Formation is from 32.7 to 33.2 Ma. The ages of the uppermost strata of the Member 1 of Shahejie Formation of Chegu29, Che35, Chegu203, Dagu63 wells are 32.4, 32.4, 32.1, 32.5 Ma respectively.


Yin H.Y.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Yin H.Y.,Shandong University of Science and Technology | Wei J.C.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Wei J.C.,Shandong University of Science and Technology | And 9 more authors.
Procedia Engineering | Year: 2011

In order to understand the displacement regular of rock mass in coal seam floor, displacement monitoring sensors were arranged in underground boreholes and realized the dynamic monitoring displacement of rock mass. First, the geological and the hydrogeological condition of the 1604 workface and NanTun coalmine were analyzed. Second, boreholes was constructed in roadway on the 1604 workface, displacement monitoring sensors were arranged in boreholes in different depth, when the distance of mining position and borehole was 110 m, the displacement monitoring sensor started monitoring, which the different depth displacement data were collected. Last, through comparing displacement data in different depth, the paper point out as the development of mining the influence degree of the displacement of rock mass in coal seam floor can be divided into initial influence stage, obvious influence stage and significant influence stage. Workface mining caused the depth of the rock mass displacement variation from 11.95 to 13.94 m below coal seam. The result will guide the coalmine prevention and control of water inrush from coal seam floor. © 2011 Published by Elsevier Ltd.


Yu J.-F.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Yu J.-F.,Shandong University of Science and Technology | Yu Y.,Shandong University of Science and Technology | Fu W.-Z.,Shandong University of Science and Technology | And 4 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

Based on the interpolation theory, a computer routine composed of the interpolation function Interp1 on Matlab platform was written to realize the interpolation of well logs automatically. The GR curve of part of Permian strata of well G1 in Jiyang depression was interpolated with the computer routine in both cases of interpolation with given interval and with given total number of data, and thereafter wavelet analysis of the interpolated well logs was carried on. The results show that the interpolated well logs are of high fidelity compared with the original on the one hand and more convenient for multi-scale geological interpretation, on the other hand. 8 small-scale cycles, 4 medium-scale cycles and 2 large-scale cycles are classified in the case well profile, which verified the validity and practicability of the Matlab routine.


Shi L.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Shi L.,Shandong University of Science and Technology | Qiu M.,Shandong University of Science and Technology | Wei W.,Shandong University of Science and Technology | And 2 more authors.
International Journal of Mining Science and Technology | Year: 2014

The method of singular coefficient of water inrush to achieve safety mining has limitation and one sidedness. Aiming at the problem above, large amounts of data about water inrush were collected. Then the data, including the maximum water inrush, water inrush coefficient and water abundance in aquifers of working face, were processed by the statistical analysis. The analysis results indicate that both water inrush coefficient and water abundance in aquifers should be taken into consideration when evaluating the danger of water inrush from coal seam floor. The prediction model of safe-mining evaluation grade was built by using the support vector machine, and the result shows that this model has high classification accuracy. A feasible classification system of water-inrush safety evaluation can be got by using the data visualization method which makes the implicit support vector machine models explicit. © 2014 Published by Elsevier B.V. on behalf of China University of Mining & Technology.


Mao G.-Z.,Northwest University, China | Mao G.-Z.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Mao G.-Z.,Shandong University of Science and Technology | Liu C.-Y.,Northwest University, China | And 4 more authors.
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2012

Hydrocarbon-generating simulation experiment was proceeded using hydrocarbon source rock containing kerogen type I with uranium (sandstone uranium ore) added. The effects of uranium on the hydrocarbon generation by relevant parameters of simulation experiment products were studied comparatively. The results show that uranium can facilitate the long-chain hydrocarbons cracking into low molecular weight hydrocarbons at the temperature above 400 °C, as a result the molecular weight of hydrocarbons products is lowered. The degree of dry gas increases, while the CO 2 and H 2 are largely generated, and the uranium lowered the variation temperature for about 50 °C. Uranium can lower the peak temperature of total liquid hydrocarbons generating. 350 °C is the transition temperature of alkenes yield, above which alkenes changes into alkanes. Uranium can enhance the isomerization of alkene produced in the simulating experiment, and make the molecule lattice of alkene member arraying more closely. It's mature of products in the characteristic parameters of group composition, saturated hydrocarbon GC, biomarkers generated in the hydrocarbon-generating simulation experiment of hydrocarbons source rock with uranium. The uranium may enhance the maturity of organic matters. The existence of uranium in hydrocarbon source rocks is favorable to the generation of the immature hydrocarbons. It means that uranium in hydrocarbon source rocks is maybe one of the inorganic accelerating factors of the hydrocarbon generation. Such a small amount of hydrocarbon generated in advance can change the reservoir into a lipophilic reservoir, and it provides advantage conditions for migration and accumulation of late large-scale generated hydrocarbons. It makes the dense reservoir becoming large-scale industrial hydrocarbon reservoirs.


Qiu M.,Shandong University of Science and Technology | Qiu M.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Shi L.,Shandong University of Science and Technology | Shi L.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | And 2 more authors.
Mine Water and the Environment | Year: 2016

The exploitation of deep coal seams in North China’s coalfields is seriously threatened by water inrush. Water inrush is controlled by multiple factors and its processes are often not amenable to mathematical expression. To predict and prevent water inrush from the underlying Ordovician aquifer during mining of the No. 13 coal seam in the Liangzhuang coal mine, we used an innovative combination of methods to assess the risk of water inrush based on the fuzzy Delphi analytic hierarchy process (FDAHP) and grey relational analysis (GRA). Expert opinions and GRA were applied to obtain the relative importance of each of the major controlling factors, and the total weights of all factors were assigned using FDAHP. This allowed us to develop a risk index map in which the study area was divided into two zones and four subzones based on the risk index. © 2016 Springer-Verlag Berlin Heidelberg


Chang X.-C.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Chang X.-C.,Shandong University of Science and Technology | Han Z.-Z.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Yan C.-P.,Shandong University of Science and Technology
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2012

The south slope of Dongying sag is a favorable petroleum exploration target. The research results indicate that Es 4 oils show typical characteristics of mixed oils. The source inputs contain dual contributions of aquatic lives and high plants, thermal maturities are varied from low mature to mature, sedimentary environments are mainly reduction with different intensities, and part samples show characteristics of mixed oil charging before and after biodegraded. According to the geochemical correlation, for the east part of south slope with Niuzhuang sag as source kitchen, Le'an and Wangjiagang oil fields are Es 4-sourced oils mixed with few Es 3-sourced. For the middle part with Niuzhuang and Lijin sag as source kitchens, Liangjialou oilfield is Es 3-sourced oils mixed with few Es 4-sourced, while Chunhua oilfield is reversed. For the west part with Boxing sag as source kitchen, Zhenglizhuang and Gaoqing oilfields are Es 4-sourced oils mixed with few Es 3-sourced, while Jinjia oilfield is Es 3-sourced. Mature oils generated from Es 4-Es 3 in the subsag center are mixed by the low mature oils generated from Es 4 in the slope, migrated along faults and unconformities, and accumulated on the high parts of the south slope.


Fu W.-Z.,Shandong University of Science and Technology | Yu J.-F.,Shandong University of Science and Technology | Yu J.-F.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Yang F.-J.,Shandong University of Science and Technology | And 4 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2013

Milankovitch cycle is the manifestation of Milankovitch effect in the stratigraphic record. Its time property is an effective means to divide and constrast the high-resolution strata. In order to reveal the differences of Milankovitch information preserved among different stratigraphic units, enrich stratigraphic theory, especially cyclostratigraphic theory, Milankovitch features were extracted by means of the Extreme Mode method of one-dimensional Continuous Wavelet Transform from related strata based on the GR well logging data of 38 wells in Jiyang Depression Zone, and the thickness of the cyclothems recognized corresponding to the precession, obliquity and eccentricity was calculated respectively and their fluctuation was also analyzed. The results show that, in the study area, there widely exists Milankovitch information in several stratigraphic intervals. Among them, the thickness of the precession cyclothem varies in ranges of 3.4-17.1 m, 8.6-19.0 m and 7-11 m in Early Paleozoic (∈-O), Late Paleozoic (C-P) and Cenozoic (E-N) correspondingly. And among them, 13m, 14m and 10m cycles are the principal ones; the thickness of the obliquity cyclothem, in the same way, 7.2-27.8 m, 19.5-39.2 m and 14-26 m, with 27 m, 26 m and 21 m as principal cycles while eccentricities are 20.3-64.6 m, 37.2-75.1m and 40-60 m, and 60 m, 74 m and 51m being principal ones. The thickness of Milankovitch cyclothem in Mesozoic varies in ranges of 3.2-21.4 m, 6.2-42.8 m and 15.4-108.6 m, corresponding to precession, obliquity, and eccentricity respectively, with no obvious principal cycle. A conclusion can be drawn that the fluctuation of the thickness of Milankovitch cyclothem tends to strengthen with the aging of the geological intervals from Cenozoic (E-N), Late Paleozoic (C-P) to Early Paleozoic (∈-O), that is, the stability of Milankovitch cycle information preserved in the older strata is deteriorated more by the following geological events. The strongest fluctuation of the thickness of Milankovitch cyclothem in Mesozoic was probably resulted from the stronger sedimentary environment differentiation caused by the active tectonics. Furthermore, the accumulation rate was calculated and explained for different geological intervals in terms of the thickness of principal cyclethom.


Shi L.-Q.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Xin H.-Q.,Shandong University of Science and Technology | Zhai P.-H.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | Li S.-C.,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals | And 3 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2012

It is shown that the empirical formula widely used by technical staff to calculate the height of the water flowing fracture zone in underground mines is unreasonable and has limited application. An analysis of the background of this empirical formula shows only mining thickness is taken into account. A new theoretical formula appropriate to deep mining conditions where roof rock movement is important was developed. It incorporates mining thickness, depth, face span, the rock mechanical properties and other characteristics, and aquifer water pressure. Using the Baodian coal mine number 1303 face as an example the applicability of the formula is demonstrated.


Li J.,Petrochina | Li Z.,Petrochina | Wang D.,Petrochina | Cheng H.,Petrochina | And 4 more authors.
Shiyou Xuebao/Acta Petrolei Sinica | Year: 2013

This study investigates the content of N2 and the origin and source of nitrogen isotope composition in different tectonic zones of Tarim Basin by examining the geochemical characteristics of nitrogen mched natural gas in the major oil-gas fields in Tarim Basin. Results show that the N2 content is determined by the type and maturity of natural gas. Oil-type gas generally contains more than 5% N2 and is mainly distributed in Paleozoic strata in the central uplift and Tabei uplift. Coal-type gas generally contains less than 5% N2 and is mainly found in Mesozoic-Cenozoic strata in Kuqa depression, Tabei uplift, and Taxinan depression. The content of N2 in natural gas is highest in the stage of maturity and gradually decreases with increasing maturity. The nitrogen isotope fractionation of natural gas is closely related to the type of natural gas, and light-and heavy-nitrogen isotope fractions are respectively found in natural gas in oil-and coal-type gas reservoirs. The N2 origin of natural gas in the major oil-gas fields in Tarim Basin is further analyzed. Results show that the N2 composition of natural gas in most of the oil-gas fields in Tarim Basin have identical origin with hydrocarbons gases in the same reservoirs, i.e., the products of source rocks in the stages of maturity and high to post maturity. An exception is natural gas in Akemomu gas field, which is associated with obvious mixing of mantle-derived N2.

Loading Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals collaborators
Loading Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals collaborators