沉积学报2018，Vol.36Issue(1)：166-175,10.DOI:10.3969/j.issn.1000-0550.2018.018
鄂尔多斯盆地西峰和姬塬油田长81段低渗透储层迥异性
Diversity of the Triassic Chang 81 Low Permeability Reservoirs in Jiyuan and Xifeng Area, Ordos Basin
摘要
Abstract
Using the data of drilling cores,thin sections and well loggings,focused on the reservoir characteristics and pore evolution,this paper gives a comparative analysis about the diversity of the Triassic Chang 81low permeability reservoirs in Jiyuan and Xifeng area. On the one hand, the commonalities of Chang 81reservoirs in both areas are:1)Reservoir sand bodies are underwater distributary channel sands of shallow water delta front,which are thick sand bodies of multiphase superposition with great continuity on the space. 2)The sandstones are lithic arkose and feld-spathic litharenite and belong to fine sandstones and very fine sandstones with good sorting in both areas.3)Reservoir porosity is mainly composed of primary pores and dissolution pores. The original porosity is around 38% in the study area. The loss of primary pores accounts for about 35%because of compaction and cementation.The final reservoir po-rosity is 7%. On the other hand,the differences of Chang 81reservoirs in both areas are:1)The underwater distribu-tary channel sands of Chang 81in Jiyuan area hold the unobvious superposition and belong to"continuous retrograda-tion"depositional model. In contrast,the sands in Xifeng area have the obvious vertical accretion and belong to"see-saw"depositional model. 2)The intergranular pores, lithic dissolved pores and intracrystalline pores in Jiyuan area are inferior to Xifeng area. However,the dissolved pores in Jiyuan area are superior to Xifeng area.3)In the late dia-genetic evolution stages of reservoirs,the average cementation porosity loss ratio of Chang 81sands accounts for about 13.87% and 11.99% in Jiyuan and Xifeng area,respectively. The degree of cementation pores loss in Jiyuan area is higher than Xifeng area. In addition, the dissolution pores increase ratio accounts for about 3.71% and 2.79% in Jiyuan and Xifeng area,respectively. The Jiyuan area is superior to Xifeng area.关键词
低渗透/水下分流河道/成岩改造/孔隙演化/鄂尔多斯盆地Key words
low permeability/underwater distributary channel/diagenetic reformation/porosity evolution/Ordos Basin分类
天文与地球科学引用本文复制引用
李树同,时孜伟,牟炜卫,罗安湘,王琪,邓秀芹,张文选,李阳,闫灿灿..鄂尔多斯盆地西峰和姬塬油田长81段低渗透储层迥异性[J].沉积学报,2018,36(1):166-175,10.基金项目
国家自然科学基金项目(41772142) （41772142）
兰州油气资源研究中心"十三五"科技创新基金(135CCJJ20160510) （135CCJJ20160510）
中国科学院青年创新促进会人才项目(Y410ST1LST)[National Natural Science Foundation of China,No.41772142 （Y410ST1LST）
Science and Technology Foundation of Lanzhou Center for Oil and Gas Resources Research during the"13th Five-Year Plan",No.135CCJJ20160510,Youth Innovation Promotion As-sociation CAS,No.Y410ST1LST] （）
