勃利盆地东部坳陷下白垩统城子河—穆棱组石油地质特征

发布时间：2018-03-01 11:05

  本文关键词： 勃利盆地 城子河-穆棱组 石油地质特征 烃源岩特征 生储盖组合特征　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：勃利盆地是黑龙江省东部重要的中生代断陷盆地,盆地北侧为剥蚀边界,西南为依兰~勃利断裂,南侧为兴农~兴凯断裂,东南侧为裴德断裂。基底主要由佳木斯地块和兴凯地块组成,盆地可以分为西部、中部、东部三个坳陷,地质构造非常复杂。本文以勃利盆地东部坳陷区为主要研究区,以下白垩统城子河组、穆棱组为主要研究目的层段,对勃利盆地东部坳陷的石油地质特征开展一系列研究,包括沉积特征、烃源岩特征、储盖层特征以及生储盖组合特征。通过野外地质调查和钻井资料研究,对勃利盆地东部坳陷下白垩统城子河组、穆棱组进行了沉积相划分,共识别出(扇)三角洲相、湖泊相、水下扇相3种类型,进一步识别出8种沉积亚相和19种沉积微相。城子河组沉积时期以(扇)三角洲相沉积为主,岩性主要为砂岩,地层中也发育半深湖相泥岩,沉积中心在勃利盆地勃1井附近。穆棱组沉积时期湖泊相广泛发育,泥岩大面积出露,勃利盆地ZK2、ZK3井附近均以半深湖相沉积为主,为此时期的沉积中心,湖相发育过程中伴随有水下扇沉积。勃利盆地东部坳陷下白垩统城子河组、穆棱组泥岩分布广泛,厚度较大,是研究区下白垩统主要的烃源岩层系,通过烃源岩有机地化测试分析,有机质丰度显示城子河组、穆棱组为中等烃源岩;有机质类型主要以Ⅱ2型为主,也发育有Ⅱ1型和少量Ⅲ型干酪根;有机质成熟度显示热演化程度较高,大部分有机质属于高成熟-过成熟阶段,说明下白垩统城子河组、穆棱组的烃源岩具有较大的生气潜力,主要以生气为主,生油为辅。研究区下白垩统城子河组、穆棱组储层主要为(扇)三角洲砂体,砂岩类型主要是岩屑长石砂岩,石英含量较低,长石中斜长石居多,岩屑主要为沉积岩岩屑及火山岩岩屑,也发育少量变质岩岩屑,填隙物主要为泥质杂基,砂岩的结构成熟度和成分成熟度都较低。表明城子河组属于中成岩阶段B期,穆棱组属于中成岩阶段A期。城子河组、穆棱组的孔隙类型主要以次生孔隙为主,砂岩的孔隙度、渗透率都较差,为特低、超低孔-超低渗储层。滨浅湖泥岩在研究区下白垩统城子河组、穆棱组沉积时期广泛发育,可以作为下白垩统主要的区域性盖层,此外,盆地发育的凝灰岩可以作为局部盖层。研究区下白垩统城子河组、穆棱组生储盖组合关系主要有三种类型:第一种为自生自储型,穆棱组泥岩为生油岩,而穆棱组上部砂岩可作为储层,穆棱组上部泥岩充当盖层,这种组合关系为区内重要的生储盖组合形式;第二种生储盖组合关系为上生下储型,穆棱组泥岩为生油岩,城子河组砂岩起到储层的作用,穆棱组泥岩充当盖层;第三种生储盖组合关系为下生上储型,城子河组泥岩为生油岩,穆棱组砂岩起到储层的作用,穆棱组泥岩充当盖层。
[Abstract]:The Boli Basin is an important Mesozoic faulted basin in the eastern part of Heilongjiang Province. The north side of the basin is a denudation boundary, the southwest is the Yilan-Boli fault, and the south side is the Xingnong-Xingkai fault. The basement is mainly composed of Jiamusi block and Xingkai block. The basin can be divided into three depressions in the west, middle and east, and the geological structure is very complicated. Following the Cretaceous Chengzihe formation and Muling formation as the main target strata, a series of studies have been carried out on the petroleum geological characteristics of the eastern depression of the Boli Basin, including sedimentary characteristics, source rock characteristics, Based on field geological investigation and drilling data, sedimentary facies of the Lower Cretaceous Chengzihe formation and Muling formation in the eastern depression of the Boli Basin have been divided, and the delta facies and lacustrine facies have been identified. Eight sedimentary subfacies and 19 sedimentary microfacies were further identified by 3 types of underwater fan facies. The sedimentary facies of Chengzihe formation were mainly delta facies, lithology was mainly sandstone, and semi-deep lacustrine mudstone was also developed in the strata. The sedimentary center is near well Bol 1 in Boli Basin. The lacustrine facies developed extensively in Muling formation during the sedimentary period, and mudstone appeared in large area. The semi-deep lacustrine facies was the main sedimentary center in the vicinity of ZK2 and ZK3 well in Burley Basin. In the process of lacustrine facies development, subaqueous fan deposits are associated. The mudstone of the Lower Cretaceous Chengzihe formation and Muling formation in the eastern depression of the Boli Basin are widely distributed and relatively thick, and are the main source rocks of the Lower Cretaceous in the study area. Through organic geochemistry test and analysis of source rocks, the abundance of organic matter shows that Chengzihe formation and Muling formation are medium source rocks, and the organic matter types are mainly type 鈪，

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