动静态资料在四川盆地磨溪—高石梯地区震旦系碳酸盐岩储层类型识别中的应用

Application of dynamic and static data in recognition of Sinian carbonate reservoir types in the Moxi-Gaoshiti areas,Sichuan Basin

在四川盆地安岳特大型气田磨溪-高石梯地区用静态资料建立的储集层划分标准基础上,应用单井动态资料对储集层的划分再细化,提出了定性、定量划分标准,建立不同类型储集层的动静态响应特征。研究认为:研究区储集层以缝洞型和孔洞型为主;钻遇缝洞型储层钻杆放空较多,钻井液漏失量大,酸化施工泵压较低且下降速度快,测试产量较高,主要分布在高石梯区块;孔洞型储层钻井液漏失量相对较少,酸化施工泵压较高,测试产量小于缝洞型储层,主要分布在磨溪区块。根据气井动态特征,缝洞型和孔洞型储层可再分别划分为两小类,划分参考了产气量、稳产能力、单位压降采气量,油压月递减等生产动态特征和试井解释双对数曲线。新建立的储层识别方法交叉验证了储层动静态响应,为不同类型储层开发技术对策的制订提供了实用性较强的技术参考。

Moxi-Gaoshiti blocks of Anyue Gasfield are located in Sichuan Basin. Based on the reservoir classification criteria of Moxi-Gaoshiti blocks established by static geological data,this paper proposed qualitative and quantitative classification criteria that dynamic data of single wells are applied to further refine the classification of reservoir static and dynamic response of individual reservoirs are recognized and classified. According to the study,the carbonate reservoir types in Moxi-Gaoshiti areas are dominated by fractured-vuggy and porous-vuggy types. In Gaoshiti block,fractured-vuggy reservoir type is predominant. Drilling into fractured-vuggy reservoir leads to high chance of drilling breaks and large amount of mud leakage. During acidizing treatments,pumping pressures are relatively low,and tend to drop at a high rate. The test production rates of these wells are mostly high. In Moxi block,porous-vuggy types of reservoirs are more prevailing. Compared to the fractured-vuggy type,there is less amount of mud leakage,higher pumping pressures in acidizing treatments,and lower test production rate. According to gas well dynamic characteristic,including gas production rate,rate maintenance capability,gas production per unit pressure drop,tubing pressure drop per month and dual-logarithm derivative curves of well testing,fractured-vuggy and porous-vuggy reservoir can be further subdivided into two categories. The newly established reservoir identification method cross-validates the dynamic and static response of the reservoir,and provides a practical technical reference for the development of different reservoir types.