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塔里木盆地克深气田白垩系巴什基奇克组砂岩储层是库车山前的主力产气层,具有埋藏深度大、基质物性差的特征,构造裂缝普遍发育,特征及分布复杂,且对单井产量影响较大。目前针对该地区裂缝的研究已投入大量的工作,研究内容主要包括基于钻井岩心、成像测井等资料的裂缝精细描述;多方法多轮次裂缝分布规律预测等,但是受到取心程度、地震资料品质、常规测井资料等限制,裂缝预测的效果不佳。考虑到克深气田超深层致密砂岩储层裂缝具有多尺度特征,且不同尺度裂缝的发育特征、成因及分布规律有所不同,研究将裂缝进行分级,系统地梳理了各级裂缝及其组合的发育特征和规律,并探索了裂缝与产量的关系。研究认为:(1)综合考虑裂缝的长度、开度、发育特征等因素,将克深气田储层裂缝划分为“Ⅰ级裂缝—米级裂缝”、“Ⅱ级裂缝—颗粒贯穿缝”、“Ⅲ级裂缝—粒缘缝”三级裂缝;(2)根据各级裂缝的尺度、成因及组合特征,建立了克深气田储层三级裂缝组合,即“Ⅰ级裂缝组合—优势裂缝带”、“Ⅱ级裂缝组合—优势裂缝及伴生缝”、“Ⅲ级裂缝组合—粒缘缝网”;(3)克深气田储层多尺度缝网有效沟通砂体和砂层组,连通粒间溶蚀扩大孔,产生粒内溶孔及微孔隙,提高储层的渗流能力,对单井产量影响较大,是超深层致密砂岩储层天然气高产、稳产的关键。
Cretaceous Cretaceous Bashijiqike sandstone reservoir of Keshen gas field in Tarim Basin is the main gas generating layer in front of the Kuqa Piedmont. It has the characteristics of large buried depth and poor matrix physical properties. The structural fractures are generally developed with complex features and distributions. Single-well production impact. At present, a great deal of work has been devoted to the study of the cracks in the area. The research contents mainly include the detailed description of the fractures based on the information of drilling cores and imaging logs, the prediction of the distribution of multiple rounds of fractures and so on, but the degree of coring, seismic data Quality, conventional logging data and other limitations, the effect of fracture prediction is not good. Considering that the fractures of the ultra-deep tight sandstone reservoirs in the Keqe Gas Field have multi-scale characteristics and the developmental characteristics, genesis and distribution of fractures at different scales are different, the fractures are graded and the fractures and their combinations Development characteristics and laws, and explored the relationship between cracks and yield. The research shows that: (1) According to the factors such as length, opening degree and developmental characteristics of fractures, the fractures in Kexu gas field are divided into “Grade I fracture - meter grade crack”, “Grade II crack - (2) According to the scale, origin and combination characteristics of fractures at all levels, a three-level fracture combination of reservoir in Kexu gas field was established, that is, ”Grade Ⅰ (3) Multi-scale seam network in Kexu gas field, which is characterized by the combination of fractures and dominant fractures, grade II fracture combinations, dominant fractures and associated fractures, grade III fracture combinations, Effective communication sand body and sand group, connected to intergranular dissolution and expansion of pores, resulting in intragranular dissolved pores and micropores, improve reservoir seepage capacity, single well production has a greater impact on the ultra-deep tight sandstone reservoir natural gas yield, The key to stable production.