低孔隙度低渗透率复杂断块油气田储层有效性评价方法

某区块为典型中生界低孔隙度低渗透率复杂断块油气田,不同断块储层埋深差异较大。不同埋深储层常规岩心分析孔隙度渗透率关系复杂,为储层参数准确计算及储层有效性评价带来很大困难。通过实验室岩心分析对比发现,储层渗透性受孔隙度、孔隙结构、储层埋深等多种因素共同制约,覆压孔隙度渗透率关系明显优于常压孔隙度渗透率关系。在岩心分析认识与试油相结合的基础上,建立了综合考虑储层埋深、孔隙度、孔隙结构的常压、覆压渗透率计算模型,提出了利用覆压孔隙度渗透率综合指数评价储层有效性的方法,在实际应用中取得了良好的应用效果。

Effectiveness Evaluation Method of Low Porosity-permeability and Complex Faulted-block Oil and Gas Reservoir

A certain block is a typical Mesozoic low porosity and low permeability complex fault block oil and gas field ,the buried depth of different faulted‐block reservoirs is different .Different embedded depth of the reservoir , porosity and permeability relationship of conventional core analysis is complex , so it is hard for accurate reservoir parameters calculation and reservoir effectiveness evaluation .Through laboratory core analysis ,reservoir permeability is affected by porosity ,pore structure ,reservoir buried depth and other factors ,the relation of porosity and permeability under overburden pressure is much better than that of atmospheric pressure .Based on the knowledge of core analysis and oil test , a model considering reservoir buried depth , porosity and pore structure’ s permeability calculation of atmospheric pressure and overburden pressure is established ,and a new method of overburden pore‐permeability composite index to evaluate reservoir validity is also established .T hey achieved good application effect in practice .