鄂尔多斯盆地南部旬宜地区中生界延长组天然气地球化学特征及气源分析  

Geochemical characteristics and gas source analysis of natural gas in Mesozoic Yanchang Formation in Xun(yi)-Yi(jun)area,southern Ordos Basin

作　　者：陈燕萍 Chen Yanping(Exploration and Production Research Institute of Sinopec Henan Oilfield,Zhengzhou 450018,Henan,China)

机构地区：[1]中国石化河南油田分公司勘探开发研究院,河南郑州450018

出　　处：《地质学刊》2022年第3期245-250,共6页Journal of Geology

基　　金：中国石化集团有限公司项目“中西部陆相页岩油资源潜力与目标评价”(股份P20049-3)。

摘　　要：鄂尔多斯盆地旬宜地区延长组主研究区几乎全部为产油井,而位于西南部的旬19井、郎字号等多口井见天然气流,这与延长组主研究区揭示的规律存在矛盾,气体来源不明。根据天然气组分、C同位素、C同位素序列等特征,分析认为采集的气样地球化学特征与古生界煤型气存在较大差别,为热成因气中低成熟度阶段的油型伴生气,气源单一,来自于中生界长7烃源岩。因此,旬宜研究区延长组天然气勘探具有一定的潜力,是值得重点关注的对象。The wells in the main study area of the Yanchang Formation in Xun(yi)-Yi(jun)area of the Ordos Basin are almost all oil-producing ones,while natural gas flow is found in many wells such as Xun-19 well and Lang-group wells in the southwest,which contradicts the regularity revealed in the main study area of the Yanchang Formation,and the gas source is unknown.According to the characteristics of natural gas composition,carbon isotope and carbon isotope sequence,this paper considers that there is a great difference between the geochemical characteristics of the collected gas samples and the Paleozoic coaliferous gas.The former is the oil-type gas in the middle and low maturity stage of the thermogenic gas.The gas source is single,and comes from the Mesozoic Chang 7 source rock.Therefore,the paper believes that the natural gas exploration of the Yanchang Formation in Xun(yi)-Yi(jun)area has certain potential and is worthy of special attention.

关 键 词：延长组 C同位素 成因类型 气源分析 旬宜地区 鄂尔多斯盆地 

分 类 号：P622[天文地球—地质矿产勘探]