地质找矿论丛

六盘山盆地西南缘构造特征及盆地油气有利区预测

Structural characteristics of southwestern margin and favorable areas predicting in the Liupanshan basin

投稿时间：2015-05-22 修订日期：2015-05-22

DOI：

英文关键词:structural characteristics reservoir condition favorable areas predicting Liupanshan basin

基金项目:

作者	单位
谢青^*	长安大学地球科学与资源学院

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中文摘要:

六盘山盆地发育在华北地块西南缘与祁连-秦岭构造带接合部位。针对其构造位置独特,背景复杂,盆地整体勘探程度低,研究资料和有关文献相对少,尤其是盆地西南缘构造演化更是复杂等情况。根据前人研究结果、野外调研及钻井资料,对盆地的构造演化背景、盆地西南缘主要断裂特征及盆地油气成藏条件进行了深入分析和讨论。结果表明：盆地构造复杂,断裂系统具有多期次、多级次、分段性等特点,盆地变形改造时代新,逆冲推覆构造发育,有利于油气局部运移和富集；盆地共发育石炭系、三叠-侏罗系、白垩系三套烃源岩及相互配套的储、盖条件。预测了6个较有利构造区,总结出一些盆地山前深部构造带及凹陷内的低凸起部位是有利勘探区。

英文摘要:

Liupanshan basin developed in the joint of southwestern margin of North China block and Qilian - qinling structure belt. It’s in a unique location under a complex background, the research data and relevant reference documents are inadequate; that’s especially complex for the structural evolution of its southwestern margin. According to previous research results, field survey and drilling data, in-depth analysis of the structure evolution background, the main fracture characteristics of the southwestern margin and the hydrocarbon accumulation condition are made in this study. Research suggests that this basin is of complex tectonic structure with fault system of multi-stages, multi-classes and multi- fragments. The deformation and transformation of the basin occurred in the recent eras with developed thrust nappe structure which are to the benefit of the migration and accumulation of the local hydrocarbon; the basin includes the developed source rocks from Carboniferous period, Triassic – Jurassic and Cretaceous system as well as the conditions for the interest of the reservoir and caprock. Six more favorable structural zones are predicted, it is proposed that the favorable areas for petroleum exploration should focus deep structural belt of frontland as well as the low salient part of the depres-sion zone in the Liupanshan basin.

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