库车坳陷油气相态分布的不均一性及其控制因素

Inhomogeneity of oil and gas distribution and its controlling factors in Kuche Depression, Tarim Basin

通过对库车坳陷不同地区油气地球化学特征的详细研究,发现库车坳陷油、气相态分布及地球化学特征具有不均一性。造成这种非均一性的原因有:烃源岩成熟程度的差异引起气/油比以及天然气地球化学特征的差异;成烃母质不同,造成液态烃与气态烃产率变化的多样性;在盖层封闭性稍差地区、有断裂破坏地区,天然气大量散失可形成残余油藏。库车坳陷存在多期成藏、多期构造运动,可捕获不同期的油气。

The distribution and geochemistry characteristics of oil and gas in Kuche Depression, Tarim Basin, is inhomogeneous, which may have been controlled by: (1) different levels of maturity of source rocks, (2)different geochemical characteristics of the gases, and (3)different source rocks. In the areas with poor cap rocks or destructive fractures, the gas has largely dissipated and the remaining oil formed relic oil reservoirs. Kuche Depression has experienced multiple phases of reservoir formation and structural movement, trapping different-stage generations of oil and gas.