环县—白豹地区长7段致密油差异分布控制因素  

Factors controlling the differential distribution of oil in the Chang section 7 dense sandstone of the Huanxian-Baibao area

作　　者：陆奕帆 路俊刚[1,2,3] 王攀 牟蜚声[1] 代林锋 LU Yifan;LU Jungang;Wang Pan;Mou Feisheng;DAI Linfeng(School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Chengdu,Sichuan 610500,China;Sichuan Provincial Key Laboratory of Gas Geology,Chengdu,Sichuan 610500,China;No.1 Gas Production Plant,Petro China Changqing Oilfield Company,Yulin,Shanxi 718500,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500 [2]油气藏地质及开发工程国家重点实验室,四川成都610500 [3]天然气地质四川省重点实验室,四川成都610500 [4]中国石油长庆油田公司第一采气厂,陕西榆林718500

出　　处：《世界石油工业》2023年第6期43-52,共10页World Petroleum Industry

基　　金：国家自然科学基金“源储间泥/钙质等隔层对陆相致密油(低渗透油藏)成藏控制机理研究”(41872165)。

摘　　要：鄂尔多斯盆地环县-白豹地区已探明大规模油藏,但不同地区、不同层位存在差异,没有明确成藏控制因素,阻碍了致密油的勘探与开发。基于测井资料、岩心资料、铸体薄片、扫描电镜以及试油资料,对烃源岩展布及地化特征、储层岩石学、孔隙及物性特征,以及源储配置关系进行研究与评价,明确了环县-白豹地区致密油成藏控制因素。实验结果表明:环县-白豹地区长7段发育两套烃源岩,以黑色页岩为主,干酪根类型以I型与Ⅱ_(1)型为主,长73亚段发育一套富有机质烃源岩,厚度大且分布范围广;环县-白豹地区具有高石英、中等长石、低岩屑含量的特征,长7段广泛发育粒间孔和长石溶孔,储集空间以微米级孔隙为主,渗透率较低。环县-白豹地区致密油成藏受到烃源岩展布、储层物性以及源储配置关系综合控制。长73亚段黑色页岩在研究区内广泛分布,不同地区烃源岩厚度存在差异,环县-庆城地区烃源岩厚度较大,试油结果较好,华池-白豹地区烃源岩厚度较小,试油结果较差。长7段可划分为长71油层组与长72油层组2个部分,随着孔隙度与渗透率的增加,高产井分布频率逐渐上升,低产井与干井分布频率逐渐下降,以孔隙度9%~12%、渗透率0.1~0.3mD为最佳物性分布区间。将研究区内源储配置关系划分为3种类型,其中I型长73亚段具有厚层的黑色页岩,长71与长72亚段发育有厚层砂体,是最佳的源储组合模式。Ⅱ型长73亚段黑色页岩厚度较小,且长72亚段没有砂体展布,不利于形成油藏。Ⅲ型长73亚段发育有中厚层黑色页岩,但长71亚段发育有中层泥质砂岩,弱于I型源储配置关系。Large-scale oil reservoirs have been proved in the Huanxian-Baibao area of the Ordos Basin,but there are differences in different areas and layers,and there are no clear control factors for reservoir formation,which hinders the exploration and development of tight oil.Based on well logging data,core data,cast thin section,scanning electron microscope and oil test data,hydrocarbon source rock spreading and geochemical characteristics,reservoir lithology,pore and physical characteristics,as well as source-reservoir configuration relationship were studied and evaluated,and the controlling factors of tight oil formation in Huanxian-Baipao area were clarified.The experimental results show that:two sets of hydrocarbon source rocks are developed in the Chang7 of Huanxian-Baipao area,dominated by black shale,with the cheese root type dominated by type I and type II1,and one set of organic-rich hydrocarbon source rocks is developed in the Chang73,with a large thickness and a wide range of distribution;the Huanxian-Baipao area is characterized by a high content of quartz,medium feldspars,and low clastic content,and the intergranular and feldspar soluble holes are widely developed in the Chang7,with the micron-size pore spaces dominating in the storage space,and with a relatively low permeability.Tight oil formation in the Huanxian-Baipao area is controlled by hydrocarbon source rock spreading,reservoir physical properties and source-reservoir configuration relationship.The black shale of Chang73 sub-section is widely distributed in the study area,and the thickness of hydrocarbon source rock varies in different areas,with larger thickness of hydrocarbon source rock in Huanxian-Qingcheng area and better oil test results,and smaller thickness of hydrocarbon source rock in Huachi-Baibaopao area and poorer oil test results.The Chang7 section can be divided into two parts,the Chang71 oil formation group and the Chang72 oil formation group.With the increase of porosity and permeability,the distribution frequency of high-yielding

关 键 词：鄂尔多斯盆地 成藏控制因素 烃源岩 储层 源储配置关系 

分 类 号：TE624[石油与天然气工程—油气加工工程]