准噶尔盆地陆梁隆起带构造演化特征与油气聚集

Structural Evolution and Hydrocarbon Accumulation in Luliang Uplift in Junggar basin

陆梁隆起是一个间断继承性古隆起,一直是油气运移的有利指向区,海西运动晚期的石炭纪—早二叠世构造演化基本确立了其构造格局;油气多沿继承发育的古凸起、古鼻梁进行运聚分配。陆梁隆起存在深、浅2套断裂体系,形成深、浅2套含油气组合:深层下组合成藏遵循"源控论",近源成藏,沿梁富集,主要成藏控制要素为不整合与岩相;中浅层侏罗系与白垩系均为次生油气藏,多沿梁、沿油源断裂聚集,受构造与油源断裂控制。燕山构造运动对油气成藏起改造与再分配作用;喜马拉雅构造运动对高成熟的油气起到一定的控制作用;区域性不整合和火山岩是否发育,是基岩型油气藏形成必备条件。今后勘探方向:深层下组合为夏盐凸起西北环带、石西凸起、滴北凸起;中浅层组合为石西-莫北凸起结合部、三个泉凸起、英西凹陷、滴南凸起断裂带前缘、滴北凸起断裂带前缘。

As a discontinuous successive paleo-uplift, Luliang uplift is a.favorable area for hydrocarbon accumulation and its structural framework was generally formed from the Carboniferous to thd Early Permian in late Hercynian orogeny. The hydrocarbon migration and ac- cumulation are found mostly along paleo-swells and paleo-nose bridges. There exist two faulted systems in Luliang uplift, one is deep, the other is shallow, and both of them shape two petroleum assemblages. The deep one follows ＂the source control theory＂, characterized by near-source hydrocarbon accumulation and the enrichment along the nose bridges, and unconformity and lithologic facies are its control fac- tors of reservoirs; the middle-shallow Jurassic and Cretaceous ones are all the secondary reservoirs, characterized by hydrocarbon migration and accumulation along the nose bridges and source faulted zones, and controlled by structure and source faulted zones. Yanshan orogeny plays a role of reformation and re-allocation in hydrocarbon accumulation; Himalayan orogeny takes a certain control part in high-maturity hydrocarbons. The development of regional unconformity and volcanic rocks is the necessary conditions for forming the basement hydrocar- bon reservoirs. It is suggested that the future petroleum exploration in this area should focus on such targets as the northwestern zones of Xiayan swell, Shixi swell, Dibei swell in the lower assemblage; the Shixi-Mobei swell joints, Sangequan swell, Yingxie sag, Dinan swell faulted zone front and Dibei swell faulted zone front in the middle assemblage.