库车坳陷北部构造带侏罗系阿合组构造成岩作用与储层预测

构造成岩作用是控制库车坳陷北部构造带侏罗系阿合组储层特征的重要因素，主要包括古构造应力的压实减孔作用和构造造缝两个方面。在储层特征及构造应力特征分析的基础上，通过定量分析古构造应力对北部构造带阿合组储层的压实减孔作用及构造裂缝的控制作用，对研究区阿合组的古构造应力和储层物性进行了有限元数值模拟，预测了储层有利区。研究表明，古构造应力是控制北部构造带阿合组储层物性和构造裂缝特征的重要因素。最大古构造应力与储层孔隙度呈负相关，与构造应力的压实减孔量呈幂函数正相关；最大古构造应力的方位控制了构造裂缝的优势走向，其大小控制了构造裂缝的发育程度；最大古构造应力与裂缝面密度和裂缝面孔率呈指数正相关。根据最大古构造应力与储层物性之间的交会关系，北部构造带阿合组储层可划分为孔隙型、裂缝-孔隙型和裂缝型3种类型，其中，裂缝-孔隙型又包含a型、b型、c型和d型4亚类。北部构造带巴什构造段中部黑英山—库车河一线发育裂缝-孔隙a型相对优质储层和裂缝-孔隙b型中等储层，目前尚处于勘探空白区，是北部构造带油气勘探的潜在领域，但存在一定勘探风险。

Structural diagenesis and reservoir prediction of Lower Jurassic Ahe Formation in the northern structural belt of Kuqa depression

Structural diagenesis is an important factor controlling reservoir characteristics of the Jurassic Ahe Formation in the northern structural belt of Kuqa depression, mainly involving porosity loss by compaction under paleo-tectonic stress and tectonic fractures. Based on analyzing the characteristics of reservoirs and tectonic stress, through quantitative analysis of the controlling effect of paleo-tectonic stress on porosity loss by compaction and tectonic fracture characteristics of Ahe Formation, this paper carries out the infinite element numerical simulation of paleo-tectonic stress and reservoir physical property of the Jurassic Ahe Formation in the northern structural belt of Kuqa depression, so as to predict favorable reservoir areas. The research shows that the paleo-tectonic stress is an important factor controlling reservoir physical property and tectonic fracture feature of Ahe Formation. The maximum paleo-tectonic stress has a negative linear correlation with the average reservoir porosity, and has a positive correlation of power function with the porosity loss by compaction under tectonic stress. The direction of maximum paleo tectonic stress controls the primary strike of tectonic fractures, and its magnitude controls the development degree of tectonic stress. The maximum paleo-tectonic stress has a good positive correlation of exponential function with the surface density and surface porosity of tectonic fractures. According to the mutual relationship between maximum paleo-tectonic stress and reservoir physical property, the Ahe Formation reservoirs can be divided into porous type, fractured-porous type and fractured type, and the fractured-porous type is further subdivided into subtypes a, b, c, and d. The relatively high-quality reservoir of subtype a and medium-quality reservoir of subtype b are developed in the Heiyingshan to Kuqa River area in the middle section of Bashi structural belt. This is still a blank area of exploration, and considered to be a potential field for hydrocarbon exploration but with some exploration risks.