叠合盆地复杂构造带页岩油资源评价——以准噶尔盆地东南缘博格达地区中二叠统芦草沟组为例  

Shale oil resource evaluation in complex structural belt of superimposed basin:A case study of middle Permian Lucaogou Formation in Bogda area,southeast margin of Junggar Basin

作　　者：林会喜[1,2] 宋明水[3] 王圣柱[2] 张奎华[2] LIN Huixi;SONG Mingshui;WANG Shengzhu;ZHANG Kuihua(Petroleum Exploration&Production Research Institute,SINOPEC,Beijing City,100083,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [3]中国石化胜利油田分公司,山东东营257001

出　　处：《油气地质与采收率》2020年第2期7-17,共11页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“准噶尔盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-002)。

摘　　要：页岩油是滞留于烃源岩层系各类孔隙中的液态烃类,不同区带的保存条件优劣对页岩油散失量的影响及量化表征是目前页岩油资源评价中的薄弱环节,开展复杂构造区的页岩油资源评价方法研究,对于指导中国西部经历多期构造运动的压扭叠合盆地的页岩油勘探具有重要的现实意义。为此,以准噶尔盆地东南缘博格达地区中二叠统芦草沟组为例,在地质结构精细解剖和保存评价单元划分的基础上,根据露头剖面和钻井岩石样品总有机碳含量(TOC)、S1及抽提氯仿沥青"A"含量实测数据,建立不同保存评价单元、不同岩相类型页岩油的保存系数相对权重量化赋值模型,实现对各评价单元页岩油散失程度的量化表征,并在原始页岩油资源量计算的基础上,确定现今残留页岩油资源量。研究表明:①博格达地区发育凹陷区、构造稳定区、冲断改造区和地表出露区4类保存评价单元,不同单元的岩石含油率随构造变形强度的增强、保存条件的变差整体呈减小趋势;②页岩油储层的储集空间类型和孔隙结构控制了泥岩型和砂岩型岩相TOC与含油率的差异,泥岩型页岩油两者之间呈幂函数关系,砂岩型页岩油两者则表现为线性关系;③基于不同保存评价单元泥岩型和砂岩型页岩油TOC与含油率量化模型,实现了保存系数相对权重的分单元、分岩相量化赋值,为科学评价构造改造区的残留页岩油资源量奠定了基础;④博格达地区页岩油资源物质基础雄厚,奇台庄和柴窝堡凹陷中北部为有利的页岩油勘探靶区,芦三段砂岩型页岩油为主要的勘探层段和目标类型。The shale oil is the liquid hydrocarbon trapped in various pores of source rock strata,and the studies on the influ ence of the preservation conditions of different zones on the shale oil loss and its quantitative characterization are inade quate during the shale oil resource evaluation at present.The evaluation of shale oil resource in complex structural areas is of great practical significance to guide shale oil exploration in superimposed basin that experienced multiple tectonic move ments in western China.Therefore,taking the shale oil of the Middle Permian Lucaogou Formation in Bogda area,the south east margin of Junggar Basin as an example,based on the detailed anatomy of geological structure and the division of the preservation evaluation unit,and according to the outcrop section and total organic carbon(TOC)content of the drilling rock sample,pyrolysis hydrocarbon S1 and the measured data of extraction of chloroform bitumen“A”,the relative weight assign ment quantitation models of preservation coefficients of shale oil in different preservation evaluation units and different lithofacies are established to quantitatively characterize shale oil loss degree in different evaluation unit.Based on the cal culation of original shale oil resources,the amount of residual shale oil resources is determined.The results show that:①There are four types of preservation evaluation units in Bogda area,including sag area,structural stability area,thrust trans formation area,and surface outcropping area.The oil content of rocks in different units decreases with the increase of tec tonic deformation strength and the deterioration of preservation conditions;②The reservoir space type and the pore struc ture of shale oil reservoir control the difference of TOC and oil content between mudstone and sandstone lithofacies.There is a power function relationship between mudstone and sandstone,and a linear relationship between mudstone and sand stone shale oil;③Based on the quantitation models of TOC and oil content of shale

关 键 词：芦草沟组 页岩油 资源评价 保存系数 博格达山前带 准噶尔盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]