利用TM遥感影像分析准噶尔盆地西南缘新构造运动与油气藏形成的关系

ANALYSIS ON NEOTECTONIC MOVEMENT AND ITS RELATIONSHIP WITH OIL AND GAS ACCUMU- LATION IN SOUTHWESTERN MARGIN OF JUNGGAR BASIN USING TM IMAGES

本文以覆盖准噶尔盆地西南缘的四景ＬａｎｄｓａｔＴＭ卫星遥感影像的地质解译为基础，结合野外实地地质考察所获取的地质资料以及盆地烃源岩的生烃、排烃模拟结果，对该区第二、三排构造带自上新世以来的新构造运动变形特征，背斜和断裂构造的形成时代以及新构造运动与油气藏的关系进行了综合分析。研究结果表明，该区第二、三排构造带的新构造运动变形非常强烈，发育于这二排构造带上的背斜构造和断裂构造的构造变形始于上新世末期，早更新世末期是新构造变形最强烈的时期，第二、三排背斜构造带在中更新世早期已基本形成。有利烃源岩———安集海河组的排烃高峰晚于背斜构造形成时期，其生成的油气很有可能聚集于这些背斜构造中。发育于背斜构造核部或北翼一侧的逆冲断裂构造，一方面为油气垂向运移提供良好的通道，另一方面也破坏了油气构造。

Based on the geologic interpretation of Landsat TM images covered the southwestern margin of Junggar Basin, and integrated with the geologic data obtained from the geologic field survey and the results of BSS JGI simulation for hydrocarbon generation and expulsion of source rocks, this paper analyses the neotectonic deformation character of the second and third row thrust-fold zone since the end of Pliocene, formation age of anticline and thrust structures, and the relationship of neotectonic movement with oil and gas. The research results show that neotectonic deformation of the second and third row anticline zone is very intensive, their deformation starts in the end of Pliocene, the neotectonic deformation is the most intensive in the end of early Pleistocene, the second and third row anticline zone has formed in the early stage of middle Pleistocene, the peak time of hydrocarbon expulsion for the favorable source rock-Anjihaihe Fm. is later than the formation age of these anticlines. The oil and gas from Anjihaihe Fm. is probably accumulated in these anticlines. The thrust faults usually develop near the core or in the northern limb, on one hand, they provide the pathway for vertical migration of oil and gas, on the other hand, they also cause the loss and destruction of oil and gas.