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Geology and hydrocarbon accumulations in the deepwater of the northwestern South China Sea——with focus on natural gas

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Acta Oceanologica Sinica 2015年第10期34卷 57-70页

作者： WANG Zhenfeng SUN Zhipeng ZHANG Daojun ZHU Jitian LI Xushen HUANG Baojia GUO Minggang JIANG Rufeng Zhanjiang Branch of China National Offshore Oil Corporation(CNOOC) Limited

The deepwater of the northwestern South China Sea is located in the central to southern parts of the Qiongdongnan Basin(QDN Basin),which is a key site for hydrocarbon exploration in recent *** this study,the authors did a comprehensive analysis of gravity-magnetic data,extensive 3D seismic survey,cores and cuttings,paleontology and geochemical indexes,proposed the mechanism of natural gas origin,identified different oil and gas systems,and established the model of hydrocarbon accumulations in the deep-water *** basin tectonic simulation indicates that the evolution of QDN Basin was controlled by multiple-phased tectonic movements,such as Indochina-Eurasian Plate collision,Tibetan Uplift,Red River faulting and the expansion of the South China Sea which is characterized by Paleogene rifting,Neogene depression,and Eocene intensive faulting and lacustrine *** drilling results show that this region is dominated by marineterrestrial transitional and neritic-bathyal facies from the early *** Yacheng Formation of the early Oligocene is rich in organic matter and a main gas-source *** to the geological-geochemical data from the latest drilling wells,Lingshui,Baodao,Changchang Sags have good hydrocarbon-generating potentials,where two plays from the Paleogene and Neogene reservoirs were *** reservoirs occur in central canyon structural-lithologic trap zone,Changchang marginal trap zone and southern fault terrace of Baodao *** them,the central canyon trap zone has a great potential for exploration because the various reservoirforming elements are well developed,i.e.,good coal-measure source rocks,sufficient reservoirs from the Neogene turbidity sandstone and submarine fan,faults connecting source rock and reservoirs,effective vertical migration,late stage aggregation and favorable structural–lithological composite *** study results provide an important scientific basis for hydrocarbon exploration in this re

关键词： South China Sea deepwater natural gas petroleum system central canyon reservoir-forming conditions Qiongdongnan Basin

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Accumulation conditions and key exploration&development technologies of heavy oil in Huanxiling oilfield in Liaohe depression,Bohai Bay Basin

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Petroleum Research 2020年第1期5卷 18-38页

作者： Xiaoguang Li Exploration and Development Research Institute PetroChina Liaohe Oilfield CompanyLiaoning124010China

The Huanxiling oilfield is located in the southern part of the western slope of the western sag in Liaohe *** west side of this oilfield is connected with two sets of high-quality source rocks of Member 3 and Member 4 of Shahejie Formation in Qingshui *** oilfield has fan delta,turbidite fan and other types of reservoirs,it also has cap rock of thick mudstone in Member 3 and Member 4 of Shahejie *** background of the warped basement,the warped fault-block draped compound trap zone are developed,which includes nine types of *** perspective of hydrocarbon accumulation,the slope of this area has always been the target area for hydrocarbon migration and *** analysis shows that there are multiple stages of hydrocarbon charging in this area,and the main reservoir forming period is the sedimentary period of Member 3 of Shahejie Formation and the sedimentary period of Dongying ***-quality source-reservoir-cap conditions ensure large-scale hydrocarbon accumulation in this *** on the theory of compound hydrocarbon accumulation,many types of oil and gas reservoirs,including light oil reservoir and heavy oil reservoir,have been found in this area,with total reserves of 500 million *** view of the oilfield characterized by large reservoir burial span,multiple oil-bearing strata,strong heterogeneity and various types of oils,multi-batch seismic data processing&interpretation technology and thin reservoir inversion technology based on geological model are established in the preliminary exploration period,steam-flooding physical simulation technology of heavy oil,oil-reservoir fine description technology of thermal recovery heavy oil,steam huff and puff technology of ordinary heavy oil and steam-flooding technology of mid-deep buried heavy oil are developed in the development period,and technologies such as separate-layer injection,selective injection,sand control and lifting of heavy oil are matched and

关键词： Heavy oil exploration and development reservoir-forming conditions Steam huff and puff Steam flooding Huanxiling oilfield Liaohe depression Bohai Bay Basin

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