论文部分内容阅读
针对苏里格气田东区致密储层受多期不同类型沉积、成岩作用及构造等因素影响,储集空间小、非均质性强、储层孔隙类型结构和测井响应复杂等问题,开展该区致密储层岩石物理相研究,在此基础上确定含气层下限与评价标准。研究区可划分出石英支撑强溶蚀粒间孔、溶孔型,岩屑石英砂岩溶孔型和杂基微孔致密型3类岩石物理相,并建立了致密储层岩石物理相评价划分标准。利用不同岩石物理相物性分析、试气、测井及气测全烃资料,建立了该区致密储层不同岩石物理相含气层类别下限与评价标准。不同岩石物理相含气层残余气饱和度及其差异小,而剩余可动气饱和度及其差异相对较大,相应的测井响应参数变化较大。利用所建立的含气层下限和评价标准,对目的层进行细分层段的精细对比与评价,对研究区46口井目的层段致密储层进行复查和重新评价,新增不同类别岩石物理相含气层335个,新增含气层厚度为1 095.4 m,其中新增Ⅰ类岩石物理相气层81个,新增有效厚度为294 m。
In view of the problems of different types of sedimentation, diagenesis and tectonics and other factors, the tight reservoir in the eastern area of the Sulige gas field is characterized by small reservoir space, strong heterogeneity, complex pore type structure and well logging response, Research on petrophysical facies of tight reservoir in the area, on the basis of which the lower limit of gas-bearing layer and evaluation criteria are determined. The study area can be divided into three types of petrophysical facies, such as strong intergranular pores, dissolved pores, lithic quartz sandstone dissolved pores and heterogeneous microporous dense pores supported by quartz support, and the division criteria of petrophysical facies evaluation of tight reservoirs are established. Based on the physical property analysis of different rocks, test gas, well logging and gas detection of total hydrocarbon data, the lower bounds and evaluation criteria of different petrophysical facies and gas layers in tight reservoirs of the area are established. The residual gas saturations in different petrophysical facies and their differences are small, while the remaining movable gas saturations and their differences are relatively large, and the corresponding logging response parameters vary greatly. Using the established lower limit of gas-bearing beds and evaluation criteria, the sub-layers of the target layer are compared and evaluated finely to review and reassess the tight reservoirs of the 46 target wells in the study area. New types of petrophysics There are 335 phase-bearing gas reservoirs, and the newly-added gas-bearing layer is 1 095.4 m in thickness. Thereinto, 81 new type I petrophysical gas reservoirs were newly added, and the effective effective thickness was 294 m.