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reservoir formation mechanism analysis and deep high-quality reservoir prediction in Yingcheng Formation in Longfengshan area of Songliao Basin, China

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Petroleum 2016年第4期2卷 334-343页

作者： Yongmei Zhang Xiaoqi Ding Peng Yang Yan Liu Qi Jiang Shaonan Zhang School of Geoscience and Technology Southwest Petroleum UniversitySichuan 610500China State Key Laboratory of Oil and Gas reservoir Geology and Exploitation Chengdu University of TechnologySichuan 610059China Northwest Petroleum Bureau of Sinopec Xinjiang 830011China

Although commercial gas flow was produced in several wells with recent years'exploration of Longfengshan area in Changling fault sag,the formation mechanism and controlling factors for high-quality reservoirs still remained ***,the Yingcheng tight gas reservoirs of Longfengshan area are used as an example to characterize high-quality reservoir formation mechanism and distribution *** on the thin section,SEM,X-ray diffraction,computed tomography(CT)scanning,burial history,constant-rate mercury penetration and physical properties testing,formation mechanism and controlling factors for high-quality reservoirs were *** show the following ***,the reservoir is dominated by chlorite and laumontite cements,and compaction is the most important factor to control reservoir physical *** to this,the reservoir can be divided into compacted tight sandstones,chlorite-cemented sandstones and laumontite-cemented ***,the high-quality reservoirs are formed due to early extensive laumontite precipitation and the later dissolution of laumontite by organic ***,it is found that the distribution of cementation and dissolution exhibits some regulations in sedimentary facies,and the distribution is mainly effected and controlled by the lake water and charging of fresh ***,the distribution model of various types of sandstones was *** over diagenesis and sedimentary facies reveal that the high-quality laumontite-cemented sandstones exist in the outside subaqueous fan-delta of the deep sag in Longfengshan *** findings have been validated by recent exploration wells which obtained high industrial gas flow.

关键词： Diagenesis Laumontite cement high-quality reservoir Secondary pore The outside subaqueous fan-delta

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The reservoir characteristics and their controlling factors of the sublacustrine fan in the Paleogene Dongying Formation, Bohai Sea,China

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Journal of Palaeogeography 2024年第1期13卷 127-148页

作者： Xiao-Jun Pang Guan-Min Wang Meng Zhao Qing-Bin Wang Xue-Fang Zhang School of Geosciences China University of Petroleum(East China)QingdaoShandong 266580China Tianjin Branch of China National Offshore Oil Corporation Limited Tianjin 300459China

Sublacustrine fan is an important element in continental lacustrine basins and is significant for reservoir exploration. Oil and gas resources have been found in the sublacustrine fan sandstone reservoirs of the Paleogene Dongying Formation in the Bohai Sea. In this study, the characteristics of the sublacustrine fan reservoirs and the controlling factors are studied using information from logging, cores, physical properties,casting thin sections, X-ray diffraction of clay minerals, vitrinite reflectance, rock pyrolysis, manometry data,and 3D seismic data. The sublacustrine fans of the Dongying Formation in the LD10, QHD34, and BZ21 structures show high-quality reservoirs with porosity >15 % and permeability >5 m D. The main controlling factors of the high-quality reservoirs are attributed to the favorable sedimentary facies type and negligible compaction,and cementation, substantial dissolution of K-feldspar, overpressure, and the development of faults and fractures. A high-quality sublacustrine fan reservoir model has been established to explain how these factors affected the physical properties. The favorable targets for oil and gas exploration in the Dongying Formation of Bohai Sea include undercompacted sandy debris flow reservoirs showing the dissolution of K-feldspar, and the reservoirs which are connected to the source rocks by faults. This study provides insights to establish the relationship between sedimentology, diagenesis and reservoir quality. The results of this study are significant for the exploration and development of the sublacustrine fan sandstone reservoirs in the Bohai Sea and analogous sandstone reservoirs elsewhere.

关键词： Sublacustrine fan high-quality reservoir Dissolution Overpressure Fault Bohai Sea

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Characteristics of the basement reformed volcanic edifice in Bohai Sea and its implication for hydrocarbon enrichment

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Petroleum Research 2017年第4期2卷 336-346页

作者： Tao Ye Ajuan Wei Chunrong Zhu Yuechuan Wang Kunshun Gao Jinchang Zeng CNOOC China Limited Tianjin BranchTianjin300452China

The intact volcanic edifice had been formed and finalized during the depositional stage of Mesozoic Yixian Formation in the Bohai *** residual body of the intact volcanic edifice after reformation was defined as the basement reformed volcanic *** on drilling,seismic,well logging and microscopic data in the study area,characteristics of the basement reformed volcanic edifice were well discussed,and its control on oil and gas was also *** showed that the basement reformed volcanic edifice was jointly controlled by magmatic property,paleo-geomorphology and late reformation,and the late fault cutting and differential denudation were major reformation ways of the volcanic edifice;strong and weak volcanic eruption patterns developed in the study belonged to the invertedsequence eruption,and the explosive facies and the intermediate-acidic or acidic effusive facies were the favorable reservoir facies;weathering,cycles and period boundaries controlled vertical distribution of high-quality lithofacies,and coupling between each periodic interface at different levels and residual high-quality lithofacies was the key to oil and gas *** exploration targets of volcanic rocks were to find periodic interfaces in the volcanic edifice with the residual high-quality lithofacies within 150 m from the weathering crust or eruption surface.

关键词： The reformed volcanic edifice Eruptive facies Weathering crust high-quality reservoir Yixian formation Bohai Sea

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