霸县凹陷古近系烃源岩生物标志化合物特征及对油气成藏的贡献

发布时间：2018-01-26 10:06

本文关键词： 烃源岩生物标志化合物油源对比成藏贡献霸县凹陷　出处：《油气地质与采收率》2017年06期 　论文类型：期刊论文

【摘要】：综合利用地球化学、测井、地震等资料研究霸县凹陷烃源岩的生烃潜力、有机质类型、母质来源及沉积保存条件。根据烃源岩与原油的生物标志化合物参数特征进行油源对比,厘清各套烃源岩对油气成藏的贡献。研究结果表明,霸县凹陷发育沙四段、沙三段下亚段及中亚段、沙一段下亚段4套烃源岩,具有生排烃潜力大、有机质类型好的特点,且均已进入生烃门限。其中,沙四段和沙三段下亚段、中亚段烃源岩分布较广,沙一段下亚段烃源岩仅分布于研究区南部地区。生物标志化合物参数分析结果揭示,研究区4套烃源岩的有机质输入与沉积保存条件存在差异,沙四段和沙三段下亚段有机质供应相对于沙三段中亚段和沙一段下亚段充足,但是沉积保存条件却相对较差。通过油源对比发现,霸县凹陷的原油可以分为3类单源油及2类混源油,沙三段下亚段和中亚段烃源岩是现今已发现油藏的主力贡献烃源岩,沙四段烃源岩的有机质丰度较高、生烃潜力大,但已发现以沙四段烃源岩提供油源的油藏多呈近源零星分布于深层及潜山,表明霸县凹陷以沙四段烃源岩为油源的深层及潜山油藏应具有较大的勘探潜力。
[Abstract]:The hydrocarbon generation potential and organic matter types of source rocks in Baxian sag are studied by comprehensive use of geochemistry, logging and seismic data. According to the characteristics of biomarker parameters of source rock and crude oil, oil source correlation is carried out to clarify the contribution of each set of source rocks to hydrocarbon accumulation. Four sets of source rocks are developed in Baxian Sag, including the fourth member, the lower submember of the third member and the central part, and the lower submember of the first member of Sha, which have the characteristics of great hydrocarbon generation and expulsion potential, good organic matter type, and have all entered the hydrocarbon generation threshold. The source rocks of the middle part of the middle member and the fourth member of the Shahejie formation and the lower submember of the third member of the Shahejie formation are widely distributed, while the source rocks of the lower member of the first member of the formation are only distributed in the southern part of the study area. The organic matter input and sedimentary preservation conditions of the four sets of source rocks in the study area are different, and the supply of organic matter in the lower member of the Sha 4 member and the lower part of the third member is sufficient compared with that of the middle part of the third member and the lower part of the first member of the first member. Through oil source correlation, the crude oil in Baxian sag can be divided into three types of single source oil and two types of mixed source oil. The source rocks of the lower submember and the middle part of the third member of the Shahejie formation are the main source rocks that have been discovered. The source rocks of the fourth member of the Shahejie formation have high organic matter abundance and great hydrocarbon generation potential. However, it has been found that the reservoirs supplied by the source rocks of the fourth member of the Shahejie formation are scattered in the deep layers and buried hills, indicating that the deep and buried hill reservoirs with the source rocks of the fourth member of the formation in Baxian sag should have a great potential for exploration.
【作者单位】：中国石油华北油田分公司勘探开发研究院;中国石油大学(北京)地球科学学院;
【基金】：中国石油华北油田分公司科技项目“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”(HBYT-YJY-2014-JS)
【分类号】：P618.13
【正文快照】： 2.中国石油大学(北京)地球科学学院,北京102249)butions of each set of source rocks.The result shows that there are four sets of high-quality source rocks developed respec-tively in the fourth member of Shahejie Formation(E2s4),the lower third member of Shah

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