准噶尔盆地莫索湾地区构造特征及其演化

莫索湾地区四面临凹,具有良好的成藏条件。该区经历了多期构造运动的改造,不同层系发育的褶皱类型不同。断裂在纵向上以三叠系为界可划分为深、浅两套系统,深层断裂系统主要发育在石炭系、二叠系中,全部为逆断层;浅层断裂主要发育在侏罗系中,属张扭性断裂系统,在平面上组合呈“X”型,剖面上呈负“花”状构造,构成油气运移的良好通道。利用平衡剖面法,将研究区的演化史分为凸起形成、振荡-沉降和基底掀斜三个阶段,其中第三阶段对该区的油气成藏有重要影响。

Tectonic characteristics and its evolution of Mosuowan area in Junggar Basin

There were several-depressions around Mosuowan area, which provides the advantageous oil and gas pool forming conditions. As a result of multistage tectonic activities, different strata developed different fold types. Bounded by the Triassic, the faults were classified into deep and shallow two systems in the vertical. The deep fault system was reverse faults,developed in Carboniferous and Permian system. The shallow fault system belongs to tenso - shear one developed in Jurassic. These two fault systems combined " x" shape on the plane and negative " flower" structure in the section, which formed a good passage for hydrocarbon migration. By using the method of balanced cross section, evolution history in the studied area was divided into three stages:uplift forming, oscillating - subsidence, and basement tilting stage. The third stage plays an important role in hydrocarbon reservoir forming.