沙南西洼烃源岩研究认识与思考  

Recognition and Reflection of the Research on Hydrocarbon Source Rocks in Shanan West Sub-sag

作　　者：刘丽芳 吴克强 林青 王春红 

机构地区：[1]中海石油研究总院,北京100028

出　　处：《科学技术与工程》2015年第20期225-233,共9页Science Technology and Engineering

基　　金：国家科技重大专项(2008ZX05023-001)资助

摘　　要：针对沙南西洼烃源岩研究存在的问题,从高蜡油成因、烃源岩形成的构造背景、钻井有机地化特征、烃源岩沉积环境等方面论证了沙南西洼烃源岩发育特征。研究认为,沙中构造带的高蜡原油并不代表沙南西洼生烃母质类型差,本区原油高含蜡原因主要与油气运移有关;沙南西洼具有"先沉后翘"的凹陷演化特点,这一构造演化特点决定该洼在沙三段沉积期具备中深湖发育的古构造背景;沙南西洼发育沙三段优质烃源岩,有机类型I-II1,丰度高;沙南西洼中深湖相优质烃源岩厚度较大、面积较广;受构造演化"先沉后翘"的影响,沙南西洼烃源岩成熟度较低,但仍具有较大的生烃潜力。Taking the doubts and debates on hydrocarbon source rocks in Shanan west sub-sag into considera- tion, the characteristics and potential of the source rocks there were demonstrated by the studies of high-wax oil causes, tectonic background of source rock formation, sag evolution, organic geochemical features and sedimentary environment, etc. The research suggested that the high wax crude oil did not represent the poor hydrocarbon gener- ation material in Sha＇nan west sub-sag, but mainly attributed to the hydrocarbon migration distance. The ＂subsi- ding earlier, perking later＂ feature of sag evaluation in Sha＇nan west sub-sag indicated that there had existed the structural background to forming high-quality source rock during E2S3 sedimentary period. The high quality source rocks, with I-II1 type of organic matter and high TOC abundance, were found in E2S3 formation of Sha＇nan west sub-sag. The thickness and area of high quality source rocks developed in middle-deep lacustrine environment are lager in Sha＇nan west sub-sag. Affected by tectonic evolution, the maturity of hydrocarbon source rock in Sha＇nan west sub-sag is lower, but there still have large hydrocarbon generation potential.

关 键 词：渤海海域 沙南西洼 沙三段 烃源岩 

分 类 号：TE122.22[石油与天然气工程—油气勘探]