松辽盆地德惠断陷白垩系烃源岩特征及其控藏作用  

Characteristics of Cretaceous source rocks and their controlling effect on hydrocarbon accumulation in Dehui Fault Depression,Songliao Basin

作　　者：屈卫华 田野 董常春 郭小波 李立立[3] 林斯雅 薛松 杨世和 QU Weihua;TIAN Ye;DONG Changchun;GUO Xiaobo;LI Lili;LIN Siya;XUE Song;YANG Shihe(Department of Exploration,Jilin Oil Field Company,PetroChina,Songyuan 138000,Jinlin,China;Digital Intelligence Technology Company of Jilin Oil Field,Songyuan 138000,Jinlin,China;School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China;Exploration and Development Research Institute of Jilin Oil Field Company,PetroChina,Songyuan 138000,Jinlin,China;Research Institute of Geological,China National Logging Corporation,Xi’an 710077,China)

机构地区：[1]中国石油吉林油田公司勘探事业部,吉林松原138000 [2]吉林油田数智技术公司,吉林松原138000 [3]中国石油吉林油田公司勘探开发研究院,吉林松原138000 [4]西安石油大学地球科学与工程学院,西安710065 [5]中国石油集团测井有限公司地质研究院,西安710077

出　　处：《岩性油气藏》2024年第6期122-134,共13页Lithologic Reservoirs

基　　金：中国石油天然气集团公司“十四五”前瞻性基础性重大科技项目“松辽盆地深部含油气系统研究”(编号:2021DJ0205);陕西省重点基础研究项目“富有机质沉凝灰岩有机无机协同演化及其储层形成机制”(编号:2023-JC-ZD19)联合资助。

摘　　要：基于烃源岩、天然气、储层流体包裹体等实验分析,系统研究了松辽盆地德惠断陷白垩系烃源岩地球化学特征、发育环境、天然气成因与来源、油气成藏期次以及烃源岩的控藏作用等。研究结果表明:①德惠断陷白垩系烃源岩TOC普遍大于1%,有机质类型以Ⅲ型为主,Ⅱ型样品主要分布在农安南洼陷,总体处于成熟—高成熟的大量生气阶段;火石岭组与营城组烃源岩形成于还原—弱还原、水体盐度较高的沉积环境,农安南洼陷火石岭组烃源岩中浮游生物、藻类等低等生源贡献较大,生油能力更强。②白垩系天然气组成差异大,烷烃气体积分数为2.0%~98.5%,CO_(2)体积分数为0.1%~96.5%;天然气主要为煤成气,受不同期次天然气充注影响,部分气样呈碳同位素倒转特征;郭家、华家与农安南洼陷的油气源岩以火石岭组为主;鲍家洼陷的天然气可能主要来自营城组;CO_(2)主要为无机成因,随埋深增大,碳酸盐胶结物碳同位素组成表现为正偏移,指示深部存在钻遇高无机CO_(2)气层的风险。③农安南洼陷的烃源岩正处于大量生油阶段,由南部至北部,烃源岩热演化程度逐渐增高,控制了“南油北气”的相态分布,也控制了油气成藏期次;工业油气流井主要分布在烃源岩厚度较大地区及附近,烃源岩的分布控制了油气藏的分布。Based on experimental analysis of source rock,gas and reservoir fluid inclusions,we systematically study the geochemical properties,development environment,origin and source of natural gas,hydrocarbon accumulation period and reservoir control function of the Cretaceous source rock in the Dehui fault depression,Songliao Basin.The results show that:(1)The TOC of Cretaceous source rocks in Dehui fault Depression is generally greater than 1%,the organic matter types are mainly typeⅢ,and typeⅡsamples are mainly distributed in Nongannan Depression,which is generally in the mature to high mature stage of abundant gas;The source rocks of Huoshiling Formation and Yingcheng Formation were formed in the depositional environment of reduction-weak reduction and high-water salinity,and the lower biogenic sources such as plankton and algae contributed more in the source rocks of Huoshiling Formation in Nongannan Depression,and the oil generation capacity was stronger.(2)The composition of cretaceous natural gas varies greatly,with alkane gas ranging from 2.0%to 98.5%and CO_(2) content ranging from 0.1%to 96.5%;The main type of gas is coal-derived gas,and some gas samples show signatures of carbon isotope inversion because of secondary gas charging at different epochs.In the Guojia Depressions,Huajia Depressions and Nongannan Depressions,the hydrocarbon-bearing rocks are mainly the Huoshiling Formation.The gas in the Baojia Sink probably comes primarily from the source rock of the Zhuocheng Formation.The genetic type of CO_(2) gas is predominantly inorganic.As the burial depth increases,the carbon isotopic composition of the carbonate cement shows a positive shift,indicating the risk of drilling deep into the highly inorganic CO_(2) gas layer.(3)The source rocks in Nongannan Depression are in the stage of oil generation.From the south to the north,the thermal evolution degree of the source rocks increases gradually,which controls the phase distribution of“oil from the south to the north”and controls the hydrocarbon accum

关 键 词：烷烃 CO_(2) 烃源岩 气源对比 成藏期次 煤成气 火石岭组 营城组 白垩系 德惠断陷 松辽盆地 

分 类 号：TE121[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]