塔里木盆地缝洞型碳酸盐岩油气藏油气储量计算方法研究

碳酸盐岩储层的非均质性强,利用现有井控计算的储量呈现出含油(气)面积大、地质储量大、可采储量低、动用程度低的特点。基于高精度三维地震的缝洞量化雕刻技术更准确地刻画了非均质油(气)藏储层的特点。以塔里木盆地哈拉哈塘油田某区块为例,提出了缝洞型碳酸盐岩油气藏缝洞雕刻及储量计算方法——缝洞雕刻容积法。该方法在地质建模的地震缝洞体储层雕刻基础上,按照探明储量以缝洞系统、控制储量以缝洞带、预测储量以区块为计算单元开展三级储量研究。该方法创新性地将储层量化雕刻技术应用到缝洞型碳酸盐岩油藏的储量计算中,实现了分储层类型的储量计算,该方法在科学、合理开展储量评估的同时可有效指导井位部署,实现有效动用。

Reserves Calculating Approach for Fracture-Cavity Carbonate Reservoir of Tarim Basin

Because of strong heterogeneity of carbonate reservoir, the reserves calculated by current well control features in big oil (gas)-bearing acreage, large geological reserves, low recoverable reserves and low producing degree. The quantitative carving technology based on high-precision 3D seismic data more accurately characterize heterogeneous reservoir. Taking a block in Halahatang Oilfield of Tarim Basin as an example, a new carving and reserves calculating approach for fracture-cavity carbonate reservoir, i.e. fracture-cavity carving volumetric method is proposed. The new approach is based on seismic fracture-cavity reservoir carving of geological modeling to study tertiary reserves by proving reserves with fracture-cavity system, controlling reserves with fracture-cavity zone and predicting reserves with blocks. The approach applies reservoir quantitative carving technology to reserves calculation of fracture-cavity carbonate oil reservoir and accomplishes reserves calculation based on reservoir types. It makes scientific and rational reserves evaluation feasible; meanwhile, it could effectively guide arrangement of wells and achieve effective producing.