鄂尔多斯盆地下古生界—中元古界储层固体沥青地质特征及油气勘探意义  

Geological characteristics and exploration significance of reservoir solid bitumen in the Lower Paleozoic-Middle Proterozoic in Ordos basin

作　　者：黄军平 林俊峰[4] 张雷[5] 何文祥[1,2] 李相博[3] 徐耀辉 王雅婷[3] 章贵松[5] 王宏波 完颜容 HUANG Junping;LIN Junfeng;ZHANG Lei;HE Wenxiang;LI Xiangbo;XU Yaohui;WANG Yating;ZHANG Guisong;WANG Hongbo;WANYAN Rong(Key Laboratory of Exploration Technology for Oil and Gas Research of Ministry of Education,Yangtze University,Wuhan 430100,Hubei,China;College of Resources and Environment,Yangtze University,Wuhan 430100,Hubei,China;Research Institute of Petroleum Exploration&Development-Northwest,Petro China,Lanzhou 730020,Gansn,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Exploration and Development Institute,Petro China Changqing Oilfield Company,Xi’an 710018,Shaanxi,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100 [2]长江大学资源与环境学院,湖北武汉430100 [3]中国石油勘探开发研究院西北分院,甘肃兰州730020 [4]河南理工大学能源科学与工程学院,河南焦作454000 [5]中国石油长庆油田分公司勘探开发研究院,陕西西安710018

出　　处：《河南理工大学学报（自然科学版）》2021年第4期48-58,共11页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41672117,41972122,41772099);国家油气重大科技专项(2017ZX05001-003;2017ZX05001005)。

摘　　要：通过野外踏勘和岩心观察,在鄂尔多斯盆地下古生界—中元古界发现了大量储层固体沥青,其中寒武系储层固体沥青为首次发现。对储层固体沥青分布含量、显微特征、成熟度、成因及资源潜力进行研究,结果表明:奥陶系沥青含量为0.15%~2.38%,寒武系沥青含量最高为7.62%,蓟县系沥青含量为2.21%;平面分布上,盆地南部沥青含量较高,向北逐渐降低,推测其来源可能与盆地南部下古生界—元古界的海相烃源岩有关;显微镜下,除个别发微弱荧光外,大部分储层固体沥青样品几乎不发荧光,且有一定的外观形态,边界清晰。根据激光拉曼相关参数转换,得到储层固体沥青等效镜质体反射率为2.32%~2.80%,表明已达到过成熟演化阶段。综合储层固体沥青的地质特征,认为下古生界—中元古界储层固体沥青主要为原油裂解形成的焦沥青。伴随焦沥青的形成,必然会生成大量的原油裂解气,估算下古生界—中元古界古油藏生气总量约1.207×10^(13)~2.559×10^(13) m^(3)。下古生界—中元古界储层固体沥青的大量发现及油气特征研究为寻找鄂尔多斯盆地深部大型油气田提供了重要的科学依据。Through field survey and core observation,a large number of reservoir solid bitumen has been found in Lower Paleozoic-Middle Proterozoic in Ordos Basin,and the Cambrian reservoir solid bitumen was found for the first time.Based on the study of reservoir solid bitumen's content,optical characteristics,maturity,genesis and resource potential,a series of new understandings have been obtained.The results showed that the asphalt content of Ordovician ranged from 0.15%to 2.38%,the highest content of Cambrian was 7.62%,and that of Jixian county was 2.21%.On the plane,the asphalt content in the south of the basin was relatively high,and gradually decreased to the north.It was speculated that its source might be related to the marine source rocks of Lower Paleozoic-Middle Proterozoic in the south of the basin.Under the microscope,excepting for a few weak fluorescence,most of the reservoir solid asphalt samples almost had no fluorescence,and had a clear shape and boundary.According to the conversion of laser Raman correlation parameters,the equivalent vitrinite reflectance of reservoir solid asphalt was 2.32%~2.80%,indicating that it has reached the over mature evolution stage.Based on the geological characteristics of reservoir solid bitumen,it was considered that the lower Paleozoic Middle Proterozoic reservoir solid bitumen was mainly pyrobitumen formed by crude oil cracking.With the formation of coke tar pitch,a large amount of crude oil cracking gas would be generated.It was estimated that the total amount of gas generation in Lower Paleozoic Middle Proterozoic paleo reservoir was about 1.207×10^(13)~2.559×10^(13) m^(3).The discovery of a large number of solid bitumen in Lower Paleozoic and Middle Proterozoic reservoirs and the study of oil and gas characteristics provided an important scientific basis for the search for large oil and gas fields in the deep Ordos basin.

关 键 词：鄂尔多斯盆地 下古生界—中元古界 储层固体沥青 地质特征 勘探意义 

分 类 号：TU378[建筑科学—结构工程]