海相油气地质2026，Vol.31Issue(3)：251-263,13.DOI:10.3969/j.issn.1672-9854.2026.03.004
松辽盆地嫩江组高有机质丰度页岩生烃特征及原位转化数值模拟
Hydrocarbon generation characteristics and modelling of in-situ conversion in high-abundance organic shale of Nenjiang Formation in Songliao Basin
摘要
Abstract
The shale of the Nenjiang Formation in the Songliao Basin generally exhibits a high total organic carbon content(TOC),locally exceeding 10%.However,the shale is mainly at low-to-medium maturity stage,making it a potential target stratum for in-situ conversion development.Although it is generally believed that higher TOC indicates greater hydrocarbon generation potential,there is still a lack of sufficient understanding regarding whether the in-situ conversion characteristics of different intervals depend solely on their TOC.Optimizing the most economical development intervals under a high TOC background requires additional selection criteria.In this study,two typical Nenjiang Formation shale samples with different organic abundance(with TOC of 9.63%and 5.08%respectively)are selected.Hydrocarbon generation kinetic parameters are obtained through thermal simulation experiments.By coupling the temperature field,an electric-heating in-situ conversion model is established to evaluate the in-situ development potential of the two typical Nenjiang Formation shales with varying abundances.The results indicate that both shale samples from the Nenjiang Formation predominantly generate oil.The high organic abundance shale yields more oil,whereas the low organic abundance shale has a slightly higher gas-oil ratio(GOR).With increasing heating time,the equivalent vitrinite reflectance(Easy Ro%)gradually increases from the heating well center to the periphery.By the third year,the Easy Ro%in the area within a 13 m radius from the heating well had exceeded 1.2%,indicating that the thermal maturation of organic matter in the main hydrocarbon generation zone is essentially completed.Under in-situ conversion conditions,both shales begin to generate significant amounts of oil after approximately two years of heating,reaching over 80%of their peak oil production rates in the third year.Furthermore,the cumulative oil production of the high organic abundance shale is about twice that of the low organic abundance shale.Given its higher cumulative oil production,the high organic abundance shale demonstrates superior in-situ development potential.These findings provide important theoretical support and exploration directions for the in-situ development of low-to-medium maturity shales of the Nenjiang Formation in the Songliao Basin.关键词
生烃模拟实验/生烃动力学/数值模拟/原位转化/嫩江组/松辽盆地Key words
hydrocarbon generation simulation experiment/hydrocarbon generation kinetics/numerical simulation/in-situ conversion/Nenjiang Formation/Songliao Basin分类
能源科技引用本文复制引用
郭泽阳,钟陈攀,刘岩,王星,郑双金,李阳,魏诗韵,杨灿,朱蕊英,肖自立..松辽盆地嫩江组高有机质丰度页岩生烃特征及原位转化数值模拟[J].海相油气地质,2026,31(3):251-263,13.基金项目
本文受国家自然科学基金项目"渤海湾盆地PETM事件记录和有机质富集——来自藿烷单体烃碳同位素的启示"(编号:42272175)、国家自然科学基金项目"高过成熟页岩中氮气的富集过程及其成因意义——以湘鄂西地区下寒武统页岩为例"(编号:42572197)、湖北省自然科学基金项目"深层—超深层多元复合成烃与多相态复杂油气成藏机理"(编号:2025AFA106)及国家重大科技专项课题"烃源岩生-滞-排烃临界条件与演化模式"(编号:2025ZD1400807)联合资助 （编号:42272175）
