摘要
克百断槽始于克拉玛依市北的克北断裂,NE向延伸并被大侏罗沟断裂、盆缘断裂、克-百断裂围限.火山岩储层是该断槽内的主要储层,其层位时代无据、层序不清、归属不明.笔者通过对克百断槽古 66井 242.14～800.18 m井段详细的岩心编录、测井曲线岩电识别及关键层位火山岩锆石U-Pb年代学研究,结果表明:古 66井 242.14～800.18 m井段是被两层陆源粗碎屑岩(标志层)分隔的 3套火山岩建造,于玄武安山岩中获得(304±3)Ma和(303±2)Ma的LA-ICP-MS锆石U-Pb年龄,其岩石组合、时代、层序、地层厚度均与井北缘哈山一带哈拉阿拉特组建组剖面C2h1～C2h3 岩段总体可对比.古 66井所处的克百断槽是一个四周被断层围限的相对独立火山岩型储层断槽油气藏,这一油气藏新类型丰富了西准噶尔盆内油气藏类型.同时,该断槽具有向南西延伸的构造条件、储层类型和圈闭样式,因而是后续扩大油气勘探的新靶区.
Abstract
The Kebai fault-trough originates from the Kebei fault at the southwest end and extends northeast-ward,intersected by the Dazhuluogou fault,which begins in the northern region of Karamay City.It is bounded by the basin-edge fault on its northwest edge and the Kebai fault on its southeast edge.The primary reservoirs within this fault-trough are composed of volcanic rock.However,the stratigraphic allocation,age,and sequence of these volcanic rocks remain uncertain.This study employs a comprehensive approach involving detailed core logging,lithodensity identification using well logging curves,and zircon U-Pb dating of key volcanic rock lay-ers within the interval of 242.14～800.18 m in the well Gu 66,located within the Kebai fault-trough.The results of our investigation reveal the following insights:The interval from 242.14～800.18 m in the well Gu 66 encom-passes three distinct sets of volcanic rock formations,interspersed by two layers of terrestrial clastic rocks func-tioning as marker beds.Through zircon LA-ICP-MS U-Pb dating,we determined ages of 304±3 Ma and 303±2 Ma for the andesite in the well Gu 66.The rock composition,ages,stratigraphy,and thickness of these forma-tions show notable similarity to the C2h1～C2h3 sections of the Hala'alate Formation profile situated in the north-ern edge of the Hashan region.The Kebai fault-trough,hosting the well Gu 66,represents a distinctive fault-trough characterized by volcanic rock reservoirs,enclosed by surrounding fault structures.This novel type of hy-drocarbon reservoir expands the repertoire of oil and gas reservoir types found in the western Junggar.Further-more,the fault-trough exhibits structural attributes,reservoir characteristics,and trap styles that extend south-westward,rendering it a promising new target area for forthcoming oil and gas exploration.
基金项目
国家科技重大专项(2017ZX05008-006-003-001)
国家重点研发计划深地资源勘查开采重点专项(2018YFC060400)
中国石油天然气股份有限公司科学研究与技术开发项目(2022DJ0507)
中石油前瞻性基础研究项目(2021DJ0405)
维普
万方数据