收稿日期: 2015-02-12
修回日期: 2015-03-29
网络出版日期: 2015-12-10
基金资助
国家油气重大专项(编号:2011ZX05003)；中国石油科技开发项目(编号:2014B-04)联合资助.
Hydrocarbon Accumulation Prospect and Charge History of the Northern Monocline Belt in Kuqa Depression of Tarim Basin,Western China
Received date: 2015-02-12
Revised date: 2015-03-29
Online published: 2015-12-10
北部单斜带是库车坳陷油气成藏研究程度最低的构造带。基于流体包裹体、定量颗粒荧光和激光拉曼等分析技术对北部单斜带的油气充注史进行详细的研究，并结合生储盖和圈闭条件对其成藏潜力进行了评价。根据其常规孔隙型储层和裂缝储层的岩心样品对比分析表明，孔隙型储层中流体包裹体主要为单相黄色荧光油包裹体，储层QGF指数都大于6,QGF-E强度都大于20pc,油气充注显示出明显的继承性特点;裂缝型储层中包裹体主要为蓝白色荧光固液气三相包裹体和气液两相包裹体，储层QGF指数、QGF-E强度和R1都显示出异常值，与孔隙型储层原油物性具有较大差异，认为储层早期(65Ma左右)经历一期油充注，晚期喜马拉雅造山运动使地层强烈褶皱产生大量裂缝，沟通了其他储层或源岩，使得晚期(10Ma左右)生成的轻质油沿裂缝网络发生一期充注，之后又经历一期(3Ma左右)气洗。研究区生储盖条件匹配良好。烃源岩演化达到主要生油阶段，部分地区的三叠系甚至达到生气阶段。储层物性致密，裂缝控制“甜点”发育，致密油气的勘探具有广阔的潜力。
吴海，赵孟军，卓勤功，鲁雪松 . 库车坳陷北部单斜带油气充注史及成藏潜力分析[J]. 天然气地球科学, 2015 , 26(12) : 2325 -2335 . DOI: 10.11764/j.issn.1672-1926.2015.12.2325
The lowest exploration level tectonic belt of Kuqa Depression is the Northern Monocline Belt.A detailed study was done to unravel the charge history of northern Monocline Belt in Kuqa Depression based on the techniques of fluid inclusion,quantitative grain fluorescence and laser Raman.By combining the characteristic of the source rock,reservoir,seal and trap we can make an evaluation of the petroleum exploration prospective play.According to the porous sand reservoir and fractured reservoir core sample analysis,the fluid inclusions in porous sand reservoir samples are single phase(liquid oil)with yellow fluorescence,the QGF index in the reservoir is generally greater than 6,QGF-E intensity is greater than 20pc,showing obvious inherited characteristic of the hydrocarbon charging,while two-phase(vapor and liquid oil)and three-phase(solid bitumen,liquid oil and vapor)fluid inclusions with blue-white fluorescence are dominant in the fractured reservoir samples and the QGF index,QGF-E intensity and R1 show outliers in them.It is concluded that the northern Monocline Belt had experienced hydrocarbon charge in three different stages.In the first stage(about 65Ma),the porous sand reservoir is charged by the immature oil,after that the study area experienced Himalayan orogeny which made the stratum fold strongly and formed a large numbers of fractures which connected other reservoirs or source rock,leading to the charge of light oil in the second stage(about 10Ma).In the third stage(about 3Ma),the fractured reservoir was flushed by the gas.The source rock,reservoir and seal in the study area match well in the vertical.Source rock has entered the stage of generating light oil,some zones even entered the stage of generating condensate or dry gas nowadays.The development of “sweet point” was controlled by fractures in the tight reservoirs in the tight reservoirs which is promising for the petroleum exploration in the northern Monocline Belt.
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