论文详情
巴中地区千佛崖组储层较薄且致密,不均匀裂缝发育,储层非均质性强。综合利用岩心、测井、地震等资料预测了储层裂缝发育特征及其分布特征,采用AVO技术建立了烃类指示因子DHI并进行目的层含气性分布预测,分别从剖面和平面上对比分析了研究区裂缝分布特征与含气性分布关系。结果表明,巴中地区千佛崖组储层裂缝类型复杂多样、产状多变,发育位置主要为千一段和千二段逆断层上盘构造曲率大的区域;含气性主要分布于千二段中、上亚段,千一段次之;分析裂缝与含气性关系发现,研究区致密砂岩储层中裂缝比较发育的层段含气性明显偏高,裂缝分布与气层分布对应关系好。因此,该地区裂缝分布规律研究对储层预测以及寻找高产气藏具有重要指导意义。
The reservoir of Qianfoya formation in Bazhong area is characterized by thin tight sandstone,diverse fractures,and strong heterogeneity.Based on the core,logging and seismic data,the development and distribution characteristics of fractures in reservoir were analyzed.The hydrocarbon indicator factor DHI was established using AVO to predict gas-bearing ability.The relationship between gas-bearing ability and fractures of tight sandstone reservoir in Qianfoya formation in Bazhong area was analyzed from plane and section.The results showed that the types of fractures in Qianfoya formation in Bazhong area are complex,diverse,and rich in occurrence,the fractures are mainly located in the area with large structural curvature on the upper of the reverse faults in J2q1 and J2q2.Gas is mainly distributed in upper J2q2 submember and middle J2q2 submember,the J2q1 secondly.In the formations with well-developed fractures,the gas-bearing ability is better.Therefore,a better understanding of the distribution laws of fractures will be of great significance to forecasting reservoirs and finding more high-deliverability gas reservoirs.
国家科技重大专项(2016ZX05047-002)资助。