基于岩心物性资料和成像资料的储层裂缝评价方法

Evaluation of Reservoir Fractures Based on Physical Property and Imaging Data

塔里木盆地库车坳陷克深地区超深层储层埋藏深,地层条件复杂,网状缝-垂向缝发育,为裂缝-溶蚀孔型储层。在裂缝型储层中,裂缝不仅是油气的储存空间,更是油气的渗流通道,因此裂缝识别对储层评价至关重要。从裂缝形成机理出发,结合高压岩心试验,研究了一套针对克深地区致密砂岩储层裂缝识别的方法,即利用岩心试验方法得到视裂缝孔隙度和视裂缝渗透率,并与常规孔隙度和渗透率进行拟合,得到视裂缝孔隙度和视裂缝渗透率的计算公式。计算结果与成像测井资料识别结果符合率为75%,说明该方法在评价致密砂岩裂缝型储层中具有一定的适用性。

The ultra-deep reservoirs in Kuche Depression of Tarim Basin were deeply buried,the formation conditions were complicated,and the network and vertical fractures were developed,they were fractured and dissolved pore reservoirs.In the fractured reservoirs,the fracture was not only the storage space of oil and gas,also the flow channel of oil and gas.Therefore,the identification of fractures was very important for reservoir evaluation.From the aspects of fracture formation mechanism and combined with the experiment of high-pressure cores,a set of methods were established for identifying tight sandstone reservoirs in Keshen Area,namely the core test method was used to obtain the porosity and permeability of apparent fractures and matched with conventional porosity and permeability for deriving the calculation equation for both.The coincidence rate is 75%by comparing the calculation result with that of imaging data identification,it indicates that the method is applicable for evaluating tight sandstone fractured reservoirs.