摘要
为了研究饶阳凹陷沙一下亚段优质源岩的地球化学特征及其成藏贡献.基于有机碳、热解、生烃模拟实验评价源岩生烃潜力;基于源岩GC-MS实验和生烃潜力评价结果,描述源岩分子地球化学及有机相特征,利用多元数理统计方法,建立油−岩关系并定量计算原油中各源岩贡献率,总结了沙一下亚段成藏贡献规律.研究表明:沙一下亚段源岩的生烃潜力在凹陷内发育的3套源岩中最大,并且ω(伽马蜡烷)/ω(C30藿烷)、ω(甾烷)/ω(藿烷)等生物标志物参数与其他两套源岩有明显区别.原油样品可以划分为沙一下亚段来源,沙一下和沙三段混源和沙三上和下段混源3种成因类型.成藏贡献计算结果显示沙一下亚段源岩总贡献率达到58%,对东营组、馆陶和明化镇组原油贡献达到77%,对沙河街组原油贡献达到66%.饶阳凹陷沙一下亚段源岩是一套非常优质的烃源岩,成藏贡献大,应得到更多关注.沙一下亚段源岩高贡献区分布受到地质条件、成藏模式和源岩有机相控制,古近系和新近系储层原油主要来源于沙一下亚段源岩.
In order to study the geochemical characteristics and accumulation contribution of a high⁃quality source rock,lower sub⁃member of the first member of the Shahejie Formation(E2s1 L),in Raoyang depression.Based on experimental data of TOC,pyrolysis,hydrocarbon generation simulation,the hydrocarbon generation potential of source rocks was evaluated,and in combination with GC⁃MS experimental data and the result of hydrocarbon generation evaluation,molecular geochemical characteristics and organic phase characteristics were described.Furthermore,by using multi⁃dimensional statistical methods,oil⁃rock correlation was established,and the contribution rate of each source rock was quantified as well as the law of accumulation contribution of E2s1 L was summarized.The research indicates that the hydrocarbon generation potential of the E2s1 L is the highest among the three developed sets of source rocks.The biomarker parameters such as gammacerane⁃C30 hopane ratio,sterane-hopane ratio are significantly different from the other two sets of source rocks.The crude oil samples were divided into three types,including E2s3 type,mixed type derived from E2s3 and E2s1 L,and E2s1 L type.The bulk contribution rate of the E2s1 L in the Raoyang Depression reaches 58%.The E2s1 L source rock in the Raoyang sag is a high⁃quality source rock,which has a great contribution to the oil accumulation of the Raoyang depression and should get paid more attention.The high contribution areas of are controlled by geological conditions and accumulation models,and also controlled by source rock organic facies.Crude oil reserves in the Paleogene and Neogene reservoirs is primarily contributed by the E2s1 L.
作者
杨帆
王权
郝芳
郭柳汐
邹华耀
Yang Fan;Wang Quan;Hao Fang;Guo Liuxi;Zou Huayao(PetroChina Research Institute of Petroleum Exploration and Development,Beijing 102249,China;State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;Faculty of Geosciences,China University of Petroleum,Beijing 102249,China;Exploration and Development Research Institute,Huabei Oilfield Company,CNPC,Renqiu 062552,China;Faculty of Geosciences,China University of Petroleum,Qingdao 266580,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2021年第1期172-185,共14页
Earth Science
基金
国家重大基金项目(No.41690134)
国家自然科学基金项目(No.U1663210)
中国石油华北油田科技项目“饶阳-霸县凹陷环境-生物协同演化与优质烃源岩发育分布及其成藏贡献研究”(No.HBYT⁃YJY⁃2014⁃JS).
关键词
饶阳凹陷
沙一下亚段源岩
地球化学
油源对比
成藏贡献
Raoyang depression
E2s1 L
geochemistry
oil⁃source correlation
accumulation contribution
