库车坳陷大北1气藏白垩系储层裂缝发育规律

为了搞清塔里木盆地库车坳陷大北1气藏白垩系储层裂缝发育规律，以便为该气藏后续井位部署、完井酸化压裂以及建立裂缝和基质统一的三维非均质地质模型提供依据和参数，通过对该气藏单井岩心裂缝的观察描述、镜下薄片和成像测井资料的分析统计，运用系列经验公式计算求取了单井裂缝密度、开度、裂缝孔隙度、裂缝渗透率等表征大北1气藏白垩系储层裂缝发育情况的参数；并在此基础上，从气藏地层厚度与裂缝发育程度的关系，岩相、沉积微相与裂缝发育程度关系，以及构造角度与裂缝发育程度的关系等方面分析了影响裂缝发育的控制因素。最后得出结论：大北1气藏白垩系储层裂缝在粒度较细的薄砂层、构造角度大的部位中比较发育。

Fracture development pattern in the Cretaceous reservoirs in the Dabei-1 gas pool of the Kuqa Depression,Tarim Basin

To understand the fracture development pattern of the Cretaceous reservoirs in the Dabei-1 gas pool of the Kuqa Depression, Tarim Basin, is crucial to future well emplacement, completion and acid fracturing as well as 3D geologic modeling. Based on single well core fracture observation, microscopic fracture observation of thin section, and the analysis of image logging data, a series of empirical formulae were used to achieve various single well fracture parameters such as density, openness, porosity and permeability. The factors controlling fracture development were identified through analyzing the relationships between fracture development and formation thickness, lithofacies, sedimentary microfacies, structural dips, etc. It is believed that fractures are well developed in relatively fine and thin sandstone layers and in the locations with large structural dips in the Cretaceous reservoirs in the Dabei-1 gas pool.