向后筛选策略在鄂尔多斯盆地三叠系延长组储层微观非均质性评价中的应用  

Application of backward elimination procedure in evaluation of microscopic reservoir heterogeneity in Chang 6 Member,Ordos Basin

作　　者：南凡驰 林良彪[1,2] 余瑜[1,2] 陈朝兵 慕尚超 王泓波[6] 姬冠华[6] 马俊民 Nan Fanchi;Lin Liangbiao;Yu Yu;Chen Zhaobing;Mu Shangchao;Wang Hongbo;Ji Guanhua;Ma Junmin(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu Sichuan 610059,China;College of Earth Sciences&Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065;Provincial Key Lab of Hydrocarbon Accumulation Geology of Shaanxi,Xi'an,Shaanxi 710065,China;No.1 Production Plant of Northwest Branch,SINOPEC,Urumqi,Xinjiang 830011,China;No.2 Gas Production Plant of Changqing Oilfield,PetroChina,Yulin,Shaanxi 719000,China)

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]成都理工大学沉积地质研究院,四川成都610059 [3]西安石油大学地球科学与工程学院,陕西西安710065 [4]陕西省油气成藏地质学重点实验室,陕西西安710065 [5]中国石化西北分公司采油一厂,新疆乌鲁木齐830011 [6]中国石油长庆油田分公司第二采气厂,陕西榆林719000

出　　处：《石油与天然气地质》2022年第5期1155-1166,共12页Oil & Gas Geology

基　　金：国家科技重大专项(2016ZX05050006)。

摘　　要：鄂尔多斯盆地华庆地区三叠系延长组6段(长6段)和合水地区长8段储层成岩作用改造强烈,孔喉结构复杂,微观非均质性强。为更好地定量表征储层微观非均质性,对前人提出的储层微观非均质性评价参数进行了重新厘定。采用向后筛选策略,针对华庆地区长6段储层利用前人提出的相关参数建立回归方程,提出综合评价参数N,针对合水地区长8段储层利用高压压汞相关参数建立回归方程,提出参数G_(k)和G_(s),定量综合评价储层微观非均质性,同时验证向后筛选策略在解决地质问题上的可行性。结果表明:综合评价参数N与渗透率具有较好的相关性,将储层微观非均质性分为强、中等、弱,相关系数分别为0.9812,0.9496和0.7724,G_(k)与孔隙度、G_(s)与渗透率也都呈现较好的相关性。3个综合评价参数较单一评价因素相关性均有明显提高,说明向后筛选策略在储层微观非均质性定量评价方面取得了较好的结果,表明数学方法可以为相关地质问题的解决提供新的途径。The sixth and eighth members of Yanchang Formation(Chang 6 Member in Huaqing area and Chang 8 Member in Heshui area),Ordos Basin,feature complex pore-throat structure and strong micro-heterogeneity under strong diagenetic transformation.The study re-defines evaluation parameters of the microscopic reservoir heterogeneity proposed by predecessors to better quantitatively characterize the microscopic heterogeneity of the reservoir.The backward elimination procedure is adopted to establish a regression equation for the Chang 6 reservoir in Huaqing area using relevant parameters proposed by the predecessors,with N,a parameter for comprehensive evaluation,proposed.Meanwhile,another regression equation is set for the Chang 8 reservoir in Heshui area using the parameters related to high-pressure mercury intrusion,with parameters G_(k)and G_(s)proposed,to make quantitative and comprehensive evaluation of the microscopic reservoir heterogeneity while verifying the feasibility of backward elimination in solving geological problems.The results show that parameter N is in good correlation with permeability,and the reservoir can be divided into three sections according to microscopic heterogeneity:strong,medium and weak sections,with correlation coefficients of 0.9812,0.9496 and 0.7724,respectively.Besides,parameter G_(k) and porosity,as well as parameter G_(s) and permeability are also in good correlation.The correlation of the three comprehensive evaluation parameters is significantly higher than that of a single evaluation factor,indicating that backward elimination has achieved relatively ideal results in the quantitative evaluation of microscopic reservoir heterogeneity,and the mathematical method can provide new ideas for solving geological problems related.

关 键 词：定量表征 微观非均质性 向后筛选策略 储层定量评价 延长组 合水地区 华庆地区 鄂尔多斯盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]