天然气工业2017，Vol.37Issue(8)：14-21,8.DOI:10.3787/j.issn.1000-0976.2017.08.002
川东北元坝、马路背地区上三叠统须二段石英砂岩储层天然气产能差异的原因
Reasons for the productivity difference of quartz sandstone gas reservoirs of Upper Triassic Xu 2 Member between Yuanba and Malubei areas in NE Sichuan Basin
摘要
Abstract
Yuanba and Malubei are the main gas producing areas of the second member of Upper Triassic Xujiahe Fm (Xu 2 Member) in NE Sichuan Basin.In both areas,lithologic gas reservoirs composed of quartz beach bar facies strata are dominant,but their productivity is quite different.In this paper,the laws and differences of natural gas enrichment and high & stable yields of Xu 2 Member quartz sandstone reservoirs in both areas were discussed from the aspects of sedimentary environment,reservoir diagenesis and hydrocarbon accumulation conditions and patterns based on previous research results and newly collected assay data,seismic sections and logging data.It is shown that due to the restriction of quartz particle content of the rock itself and the fracturing scale,neither the sedimentation nor the reservoir diagenesis is the principal factor leading to the huge difference of Xu 2 Member natural gas enrichment between these two areas even though the sediments supplied by Dabashan provenance and the paleogeomorphy and hydrodynamic condition in the Malubei area are beneficial to the preservation of soluble interstitial materials and the strong tectonic movement in the Malubei area is conducive to the formation of fracture networks to enhance the reservoir connectivity.In the Malubei area,there are deep-source reverse faults with large fault displacement and vertical depth,and they connect the overlying Xu 3 Member source rocks with the Xu 2 Member reservoir and communicate marine source rocks,so natural gas can migrate laterally and vertically to quartz sandstone reservoirs continuously.Thus,the combined hydrocarbon accumulation model of "double hydrocarbon supplying and three dimensional migrating" is formed,and it is exactly the key factor contributing to the high and stable yields of Well M101 in this area.关键词
四川盆地/元坝地区/马路背地区/晚三叠世/石英砂岩/储集层/岩性气藏/高产稳产/主控因素Key words
Sichuan Basin/Yuanba area/Malubei area/Late Triassic/Quartz sandstone/Reservoir/Lithologic gas reservoir/High and stable yield/Main controlling factor引用本文复制引用
程立雪,王威,王涛..川东北元坝、马路背地区上三叠统须二段石英砂岩储层天然气产能差异的原因[J].天然气工业,2017,37(8):14-21,8.基金项目
国家科技重大专项“四川盆地碎屑岩层系油气富集规律与勘探评价”(编号:2016ZX05002004). （编号:2016ZX05002004）
