塔中寒武系深层白云岩储层测井评价技术

Logging Evaluation Technology of Cambrian Deep Dolomite Reservoir in Tazhong Area

塔中寒武系深层白云岩储层具有埋藏深、岩性复杂等特点,油气藏储集空间以次生溶蚀的孔洞为主,并伴有裂缝发育,导致储层非均质强,油水关系复杂,储层定量评价及流体性质判别困难。经过测井攻关研究及实际井的应用实践,文章首次提出一套适用于塔中地区寒武系深层白云岩储层测井评价技术;该技术充分依据微电阻率扫描成像、元素俘获、热中子及声波扫描成像等测井新技术资料,依靠以电成像视地层水电阻率谱为主的专利技术,精细刻画白云岩储层的孔、洞、缝特征,评价储层有效性,确定储层流体性质,支撑塔中寒武系深层白云岩油气藏的发现与评价,见到明显的地质效果。

The Cambrian deep dolomite reservoir in Tazhong area is deeply buried and complex in lithology. The hydrocarbon pore volume mainly consists of secondary erosional vugs accompanied with fractures. This may cause strong reservoir heterogeneity and complex oil-water relationship. This makes reservoir quantifi- cation and fluid identification difficult. A logging evaluation technology which suits Cambrian deep dolomite reservoir in Tazhong area is proposed after researching and practicing. This technology is based on MESI, ECS, APS,Sonic Scanner and combined with MESI Apparent Formation Water Resistivity Spectrum. It can not only finely describe the feature of vugs and fractures developed in dolomite reservoir, hut also play well in effectiveness evaluating and fluid confirming of reservoir and plays an important role in discovery and e- valuation of Cambrian deep dolomite reservoir.