致密砂砾岩储层裂缝形成及储层评价:以黄河口凹陷沙二段为例Fracture Generation and Reservoir Evaluation of Tight Glutenite Reservoir:A Case Study of Second Member of Shahejie Formation in Huanghekou Depression
李欢;王清斌;庞小军;代黎明;刘晓健;
摘要(Abstract):
研究致密储层裂缝的特征、成因及控制因素对储层有效评价和优质储层预测具有重要意义。利用岩心、铸体薄片、普通薄片、钻井中途测试(DST)、测井、地震等资料,对研究区沙二段特低、超低孔-超低渗砂砾岩储层裂缝特征进行了分析,探讨了裂缝发育的主控因素,并对储层进行了分类评价。结果表明:(1)研究区发育构造缝、原生缝和成岩缝。(2)构造缝多尖灭于其他裂缝,多呈半充填-未充填状,连通性较好,将储层渗透率提高了2~4个数量级;原生缝和成岩缝大多呈全充填状,有效性较差。(3)构造缝受抬升褶皱与沉积因素影响,背斜轴部与水下分流河道底部沉积微相的叠合区是最有利的构造缝形成区带,构造缝形成早于主成藏期;原生缝、成岩缝等早期裂缝的发育提供了应力薄弱带,有利于晚期构造缝的形成。(4)利用常规测井数据和矿物成分2种方法计算储层的脆性,结果显示脆性越大裂缝越发育,两者相关性较好。(5)测试资料、裂缝刻画及孔隙结构分析表明裂缝发育带储层质量最好,发育Ⅰ类储层,次裂缝发育带Ⅰ和Ⅱ次之,致密带储层质量最差。
关键词(KeyWords): 裂缝;砂砾岩;致密储层;储层评价;黄河口凹陷;沙二段
基金项目(Foundation): 国家“十三五”科技重大专项(2016ZX05024-003)
作者(Author): 李欢;王清斌;庞小军;代黎明;刘晓健;
Email:
DOI: 10.19509/j.cnki.dzkq.2019.0119
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