川北通南巴地区须家河组储层裂缝测井评价

Determination of the Porosity Cutoff in the Xujiahe Formation Dense Clastic Reservoir in Northern Sichuan

摘要: 由于钻井重泥浆及复杂断裂构造等因素的影响，川北通南巴地区须家河组储层天然裂缝和诱导裂缝在成像测井图上常相互叠加，难以区分，是研究区储层评价和裂缝解释中的难题。从成因机理、产状特征、缝面边缘特征、相互切割特征等方面，对成像图上天然缝和诱导缝的特征差异进行了梳理，开展了研究区裂缝的测井评价方法的系统研究，进行了天然缝和诱导缝在成像图上的识别和有效区分。并基于测井、地质、岩心、测试等多种资料，开展了储层物性参数及裂s缝参数对产能的贡献分析，相比储层物性参数，储层裂缝参数与气井无阻流量的相关性更好，证明了天然裂缝的有效性对通南巴地区须家河组储层产能具有重要贡献。研究成果对后续钻井储层测井综合评价和产能分析具有重要意义。

Abstract: Due to factors such as heavy drilling mud density and complex fault structures, natural and induced fractures in the Xujiahe Formation reservoir in the Tongnanba area of northern Sichuan often overlap on FMI imaging logging maps, making it difficult to distinguish between them. This is a challenge in reservoir evaluation and fracture interpretation in the study area. A systematic study was conducted on the logging evaluation methods of fractures in the study area, including the differences in the characteristics of natural fractures and induced fractures on the imaging map from the aspects of genesis mechanism, occurrence characteristics, fracture edge characteristics, and mutual cutting characteristics. The identification and effective differentiation of natural fractures and induced fractures on the imaging map were also carried out. Based on various data such as logging, geology, rock cores, and testing, an analysis was conducted on the contribution of reservoir physical and fracture parameters to production capacity. Compared with reservoir physical parameters, the correlation between reservoir fracture parameters and unobstructed flow rate of gas wells is better, proving that the effectiveness of natural fractures has an important contribution to the production capacity of the Xujiahe Formation reservoir in the Tongnanba area. The research results are of great significance for the reservoir logging comprehensive evaluation and productivity analysis in subsequent drilling.