Basin-filling processes and hydrocarbon source rock prediction of low-exploration degree areas in rift lacustrine basins:a case from the Wenchang Formation in low-exploration degree areas,northern Zhu I Depression,Pearl River Mouth Basin,E China  

作　　者：He-Ming Lin Hao Liu Xu-Dong Wang Xin-Wei Qiu Yong-Tao Ju Jun Meng Lei Li 

机构地区：[1]China National Offshore Corporation-Shenzhen Branch,Shenzhen,518054,China [2]School of Ocean Sciences,China University of Geosciences(Beijing),Beijing,100083,China [3]North China University of Science and Technology,Tangshan,063210,China [4]Xi’an Shiyou University,Xi'an,710065,China

出　　处：《Journal of Palaeogeography》2022年第2期286-313,共28页古地理学报（英文版）

基　　金：supported by the National Science Foundation of China (Grant No. 41676050)。

摘　　要：Hydrocarbon source rocks, as a main geologic factor of petroliferous systems in a sedimentary basin, play a key role in the accumulation of oil and gas and the formation of hydrocarbon accumulations. This study, which focuses on difficulties in prediction of hydrocarbon source rocks in basins or sags with low exploration degree and insufficient hydrocarbon source rock indicators, taking the Wenchang Formation of northern Zhu I Depression, Pearl River Mouth Basin as an example, proposed a hypothesis of “finding lakes and hydrocarbon source rocks”. Detailed steps include, first, determination of the lacustrine basin boundary according to analysis of seismic foreset facies, determination of the depositional area based on the compilation of strata residual thickness maps, determination of the lacustrine basin shape according to deciphering slope break belt system, determination of the fluctuation of paleo-water depth according to biogeochemical indicators of mature exploration areas, determination of the lacustrine basin scale based on analyses of tectonics intensity and accommodation space, which prove the existence of the lacustrine basin and identify the range of semi deep-deep lake;second, further analyses of tectonopalaeogeomorphology, paleo-provenance,palaeoclimate and paleo-water depth to reconstruct the geologic background of the original basin and semideep-deep lacustrine facies, to determine the distribution of semi-deep/deep lacustrine sediments in combination with studies of logging facies, core facies, seismic facies and sedimentary facies, and to rank the sags’ potential of developing hydrocarbon source rocks from controlling factors of source-to-sink system development;third, on the basis of regional sedimentary facies analysis, through identification and assessment of seismic facies types of semi-deep/deep lacustrine basins in mature areas, establishing “hydrocarbon source rock facies” in mature areas to instruct the identification and depicting of hydrocarbon source rocks in semideep/deep l

关 键 词：Wenchang Formation Pearl River Mouth Basin Low-exploration degree areas Rift lacustrine basins Reconstruction of original basins Source-to-sink system Basin filling process Hydrocarbon source rock facies 

分 类 号：P618.13[天文地球—矿床学]