吉木萨尔凹陷芦草沟组致密油地质特征与勘探实践  

Geological Characteristics and Exploration Practice of Tight Oil of Lucaogou Formation in Jimsar Sag

作　　者：匡立春[1] 王霞田[2] 郭旭光[2] 常秋生[2] 贾希玉[2] 

机构地区：[1]中国石油新疆油田分公司,新疆克拉玛依834000 [2]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《新疆石油地质》2015年第6期629-634,共6页Xinjiang Petroleum Geology

摘　　要：吉木萨尔凹陷形成于海西运动晚期，燕山运动期改造作用较强，定型于喜马拉雅运动期，现今为西断东超的箕状凹陷。中二叠统芦草沟组全凹陷分布，以咸化浅湖—深湖相沉积为主，是一套优质的烃源岩，有机质类型主要为Ⅰ型和Ⅱ1型的混合型，目前处于成熟阶段。与其他地区致密油对比，芦草沟组致密油“甜点”具有单层薄、纵向上跨度大的特点，有两段“甜点”发育相对集中段。“甜点”储层以白云质粉细砂岩为主，覆压孔隙度平均10.8%，覆压渗透率为0.001~0.6 mD，以微细溶蚀孔为主。The Jimsar sag is formed in the late Hercynian period, transformed strongly in Yanshanian period, and shaped in Himalayan period. Today it’s a half graben？like sag with fault in the west and overlap in the east. The Middle Permian Lucaogou formation distributs in the whole sag with the major sedimentary assemblage of saline shallow lake and deep lake facies. High？quality hydrocarbon source rocks are in the Lucaogou formation, and the organic matter type is mainly the mixed organic matter of Type Ⅰ and Type Ⅱ1 during mature stage.Compared with the tight oil in other regions, sweet spots of tight oil in Lucaogou formation have characteristics of thin monolayers and large vertical span with two concentrated sections of them. For sweet spots reservoir, the predominant lithology is dolomitic fine？silty sandstone,the porosity of core in net confining stress averages 10.8%, the permeability of it ranges from 0.001 mD to 0.6 mD, being dominated by dissolved micropores.

关 键 词：准噶尔盆地 吉木萨尔凹陷 二叠系 芦草沟组 致密油 地质特征 勘探实践 

分 类 号：TE121.3[石油与天然气工程—油气勘探]