酒泉盆地窟窿山油藏裂缝分布特征

Fractures distribution characteristics of Kulongshan reservoir in Jiuquan Basin

处于酒泉盆地青西凹陷南缘冲断带内的窟窿山背斜构造,轴向为北西西向,与区域构造走向相一致。在该构造内,已证实作为油藏主体的高丰度富集区块呈北北东向展布,下白垩统深层裂缝性储层的发育情况很大程度上控制了油藏分布范围。根据岩心观察描述、岩石薄片、扫描电镜、全直径岩心X-CT扫描和成像测井等各项资料,研究了下白垩统下沟组储层内裂缝的成因类型、产状,包括裂缝延伸方向、组系等特征,并在此基础上,将实验分析数据、成像测井解释结果及地震属性分析相结合,建立了该油藏下白垩统下沟组储层内的裂缝分布模型。

The axial direction of Kulongshan anticline in the south thrust belt of Qingxi Sag in Jiuquan Basin is accordance with the regional structural trend of NWW. However, the proved high oil abundance block of the structure spreads in the direction of NNE. The reservoir distribution is greatly dominated by the development situation of the deep fractured reservoir of Lower Cretaceous. Based on the core observation and description, the data of rock thin section, scanning electron microscope, X-CT scanning of whole-core and image logging, the fracture genesis, types and occurrence, including the spreading direction and the group systems of the reservoir of Lower Cretaceous Xiagou Formation are studied. Furthermore, the fractures distribution model is set up by the combination of test analysis data with image logging interpretation result and the seismic attribute analysis.