柴窝堡凹陷油气资源潜力分析

STUDIES ON THE POTENTIAL OF OIL & GAS RESOURCE IN CHAIWOPU DEPRESSION

以改造型盆地成盆、成烃和成藏理论为指导,应用沉积相分析、有效烃源岩评价、剥蚀厚度恢复及改造型盆地模拟等技术和方法,综合研究分析了柴窝堡凹陷沉积演化特征及烃源岩特征,预测了油气资源潜力,提出了有利勘探区带和目标。结果表明,柴窝堡凹陷北部及现今博格达山地区在晚二叠世沉积期属于深湖—半深湖亚相;凹陷主要烃源岩层为上二叠统芦草沟和红雁池组,位于凹陷北部,达到好—中等烃源岩级别;区内油源来自凹陷北部烃源岩,具有一定的资源潜力;最有利的勘探区带为柴杨断褶带北部和三个山冲断带,最有利勘探目标为柴窝堡构造和阿克苏构造。

The characters of sedimentary evolvement and source rock are studied,the potential of hydrocarbon resources is predicted and the best plays and prospecting objects are evaluated with the techniques of basin analysis,sedimentary facies analysis,effective source rock evaluation,denudation thickness resume,and reformed basin modeling under the guidance of the theories of basin evolution,hydrocarbon generation,and reservoir formation.It is demonstrated that the northern part of Chaiwopu depression and the present Bogeda mountain are deep lake to half-deep lake at late Permian;the main source rock,which is located in the northern part of Chaiwopu depression,is Upper Permian which belongs to good to intermediate source rock;by crude oil and source rock contrast,crude oil in the Chaiwopu structure comes from Upper Permian source rock in the northern part of Chaiwopu depression,the Upper Permian source rock has definite resources potential;the best plays are Chaiyang fault-fold belt and Sangeshan thrust-fault belt,the best prospecting objects are Chaiwopu structure and Akesu structure.