东濮凹陷古近系优质烃源岩特征与剩余资源潜力分析

Analysis to high quality source rock characteristics and residual resource potential in Dongpu Sag in Paleogene

谈玉明 李红磊 张云献 徐田武 周勇水 龚瑞程

中国石化中原油田分公司，河南 濮阳 457001 中国石化中原油田分公司勘探开发研究院，河南 濮阳457001 中国石化中原油田分公司博士后科研工作站，河南 濮阳457001 中国石油青海油田公司采气二厂，甘肃 敦煌 736200

Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China Exploration and Development Research Institute, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China Post?鄄doctoral Scientific Research Station, Zhongyuan Oilfield Company, Puyang 457001, China No．2 Gas Production Plant，Qinghai Oilfield Company, PetroChina, Dunhuang 736200, China

为明确东濮凹陷优质烃源岩特征及剩余资源潜力，采用有机、无机地球化学分析技术，应用测井预测与地质分析相结合的方法，分别从宏观和微观进行了探讨。东濮凹陷优质烃源岩有机质丰度下限为总有机碳质量分数TOC=1.0%，受古气候、古环境的控制，在沙四上和沙三下分布最广；以北部沉积中心附近的厚度最大，具有环盐岩分布的特征；不同盐度环境下形成的优质烃源岩有机质来源差异显著：咸水环境蓝藻、颗石藻和沟鞭藻均发育，半咸水环境沟鞭藻最繁盛，淡水环境则以绿藻为主；优质烃源岩是东濮凹陷主力供烃源岩，剩余资源主要分布于近优质源岩的沙三下和沙三中储层中，埋深在2 000~4 500 m，占剩余资源的59%以上，近源岩性油气藏和非常规油气是下一步油气勘探主攻方向。

In order to define the high quality source rock characteristics and residual resource potential in Dongpu Sag, the organic and inorganic geochemical analysis techniques are adopted, and the research methods of well logging prediction and geological analysis are used to discuss respectively from the macro and micro perspectives. The lower bound of organic matter abundance of high quality source rock in Dongpu Sag is TOC=1.0%. Controlled by paleoclimate and paleoenvironment, the high-quality source rocks are most widely distributed in the Es4U and Es3L section, with the largest thickness near the sedimentary center in the north, which is characterized by the distribution of cyclic salt rock. The sources of organic matter in the high-quality source rocks formed under different salinity environment are significantly different: cyanobacteria, coccolithophores and dinoflagellate are all developed in the salt water environment, dinoflagellate is the most abundant in brackish water environment, and green algae is mainly developed in the fresh water environment. The high-quality source rocks is the main soruce rocks in Dongpu Sag. The remaining resources are most widely distributed in Es3L and Es3M reservoir near to the high-quality source rocks, accounting for more than 59% of the remaining resources, with the buried depth of 2 000-4 500 m. In the next stage, exploration direction should focus on lithologic reservoir near high quality source rock and unconventional oil and gas.

10.6056/dkyqt202005002