CAJ | 학술논문

准噶尔盆地西部车排子凸起远源成藏,新近系油气藏和油气显示基本都在一套厚砂层和其上的薄砂层中,厚砂层和薄砂层之间存在密切的油源联系.针对这一成藏现象,利用区域构造、油源对比、输导体系、化验证据、成藏特征等手段,系统研究车排子的成藏体系.结果表明,车排子轻质油源岩为侏罗系,主要来自昌吉凹陷西部,油气运移指向为东南到西北方向.区域构造运动形成的白垩系与侏罗系的不整合面和红车断裂的长期活动使得油气能从深部生烃区向浅层凸起区长距离运移.沙湾组一段区域展布的厚砂层高效的横向输导作用是车排子凸起油气规模富集的关键,喜马拉雅期小断层的纵向沟通促成了沙湾组二段薄砂岩性体的最终成藏.白垩系与侏罗系的不整合面-红车断裂-沙湾组-段厚砂层的紧密接触、良好匹配构成了复式、高效的输导格榘.通过成藏体系研究,归纳总结了车排子地区的成藏模式,并提出沙湾组二段岩性油气藏和一段上倾尖灭或超覆油气藏是最有利的勘探方向.
준갈이분지서부차배자철기원원성장,신근계유기장화유기현시기본도재일투후사층화기상적박사층중,후사층화박사층지간존재밀절적유원련계.침대저일성장현상,이용구역구조、유원대비、수도체계、화험증거、성장특정등수단,계통연구차배자적성장체계.결과표명,차배자경질유원암위주라계,주요래자창길요함서부,유기운이지향위동남도서북방향.구역구조운동형성적백성계여주라계적불정합면화홍차단렬적장기활동사득유기능종심부생경구향천층철기구장거리운이.사만조일단구역전포적후사층고효적횡향수도작용시차배자철기유기규모부집적관건,희마랍아기소단층적종향구통촉성료사만조이단박사암성체적최종성장.백성계여주라계적불정합면-홍차단렬-사만조-단후사층적긴밀접촉、량호필배구성료복식、고효적수도격구.통과성장체계연구,귀납총결료차배자지구적성장모식,병제출사만조이단암성유기장화일단상경첨멸혹초복유기장시최유리적감탐방향.
The hydrocarbon reservoirs in Chepaizi uplift in the western Junggar Basin were far away from oil source.Neogene reservoirs and hydrocarbon are mostly within thick sandstone and the overlying thin sandstone.It has intimate communication of hydrocarbon sources between the oil of thick sandstone and the oil of overlying thin sandstone.In view of this appearance,the authors research the reservoir-forming system,by area structure,geochemical correlation between oil and source rock,migration system,laboratory test,pool-forming feature.It made the conclusion that the lightweight oil source rocks were Jurassic strata,which were mainly migrated from the western Changji sag with direction from southeast to northwest.The Jurassic/Cretaceous unconformity and the long-term flexible Hongche fault constituted oil migration passage,and the oil from the deep changji sag could migrate long distance to shallow uplift.The highly horizontal conducdon efficiency by the thick sand distributed widely in the First Member of Shawan Formation was the key pointofthe oil and gas'S scale enrichment in Chepaizi uplift.The vertical connection of the minor Himalayan fault facilitated pool-forming in sand lithostrome in the Second Member of Shawan Formation The Jurassic/Cretaceous unconformity,the Hongche fiult and the thick sandstone in the First Member of Shawan Formation contacted closely and mashed well,they constituted the composite and dynamical conduction framework.The authors researched the pool-forming system,generalized the pool-forming pattern,and propomd that the lithologic hydrocarbon reservoir in the the Second Member of Shawan Formation and the updip pinchout or the overlapped hydrocarbon reservoir in the First Member of Shawan Formation were the optimum exploration target.