吐哈盆地台北凹陷桃东沟群烃源岩风化校正及生排烃潜力  

Weathering correction and hydrocarbon generation and expulsion potential of Taodonggou Group source rocks in Taibei Sag in Turpan-Hami Basin

作　　者：缪欢 王延斌[1] 国建英 付媛 李建红 MIAO Huan;WANG Yanbin;GUO Jianying;FU Yuan;LI Jianhong(School of Geosciences and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;CNPC Key Laboratory of Natural Gas Accumulation and Development,Langfang 065007,China;State Nuclear Electric Power Planning Design&Research Institute Co Ltd,Beijing 100095,China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国石油天然气集团有限公司天然气成藏与开发重点实验室,河北廊坊065007 [3]国核电力规划设计研究院有限公司,北京100095

出　　处：《大庆石油地质与开发》2023年第2期22-32,共11页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“大型气田形成条件、富集规律及目标评价”(2016ZX05007);国家科技重大专项“深部煤储层精细描述及甜点区预测”(2016ZX05066001-002);中国石油天然气股份有限公司科学研究与技术开发项目“天然气成藏与开发重点实验室实验新方法研究”(2020D-5006-81);中国石油天然气股份有限公司科学研究与技术开发项目“高-过成熟天然气成因鉴别与气源示踪技术研究”(2021DJ0602)。

摘　　要：吐哈盆地台北凹陷桃东沟群地层钻井较少,而野外露头往往因风化作用导致地化参数失真。为探明桃东沟群烃源岩受风化影响程度和生排烃潜力,基于岩石热解、总有机碳、镜质体反射率等实验数据,应用风化校正法、生烃潜力法对烃源岩进行了风化校正和生排烃潜力计算。结果表明:风化作用对照壁山、坎尔其和恰勒尔剖面的样品影响较大,对塔尔朗沟剖面样品的影响较小;风化作用对生烃潜量的影响最大,其次是w (氯仿沥青“A”)的影响,对w (TOC)的影响最小;桃东沟群烃源岩有机质类型主要为Ⅲ型和Ⅱ_(2)型,部分为Ⅰ型和Ⅱ1型,有机质丰度较高,为中等—很好烃源岩,Ro为0.53%~1.49%,平均为1.03%,处于成熟阶段;台北凹陷桃东沟群烃源岩在R_(o)为0.62%时达到排烃门限,最大生烃潜力指数为615.88 mg/g,生烃中心位于连木沁次洼北部;桃东沟群烃源岩常规油气地质资源量为2.46×10^(8) t,具有良好的勘探前景。研究成果可为吐哈油田中二叠统桃东沟群油气资源的勘探部署提供理论指导。There are few wells drilled in Taodonggou Group of Taibei Sag in Turpan-Hami Basin, and geochemical parameters of field outcrops are often distorted due to weathering. In order to ascertain the weathering influence degree and hydrocarbon generation and expulsion potential of source rocks in Taodonggou Group, based on experimental data of rock pyrolysis, organic carbon and vitrinite reflectance, weathering correction method and hydrocarbon generation and expulsion potential method are used to correct weathering of source rocks and calculate hydrocarbon generation and expulsion potential. The results show that weathering has much impact on the samples of Zhaobishan, Kanerqi and Qialaer sections, and less impact on the samples of Taerlanggou section. Weathering has the most impact on hydrocarbon generation potential, secondly w(chloroform asphalt “A”), and the least w(TOC).The source rocks of Taodonggou Group in Taibei Sag are mainly Type Ⅲ and Type Ⅱ_(2), and partially Type Ⅰ and Type Ⅱ1, being medium to good source rocks with high organic matter abundance. Ro is 0.53%~1.49%, averagely 1.03%, being in mature stage. The source rocks of Taodonggou Group in Taibei Sag reached hydrocarbon expulsion threshold when R_(o)=0.62%, with maximum hydrocarbon generation potential index of 615.88 mg/g, and hydrocarbon generation center is located in the north of Lianmuqin subsag. The source rocks of Taodonggou Group in Taibei Sag have conventional oil and gas resource-in-place of 2.46×10^(8) t, showing much exploration prospect. The research are expected to provide theoretical guidance for exploration deployment of oil and gas resources in Taodonggou Group of Middle Permian in Turpan-Hami Oilfield.

关 键 词：吐哈盆地 台北凹陷 桃东沟群 风化校正 地球化学特征 生烃潜力法 

分 类 号：TE122.113[石油与天然气工程—油气勘探]