成都理工大学学报（自然科学版）Issue(4)：428-436,9.DOI:10.3969/j.issn.1671-9727.2014.04.04
四川新场地区须四段相对优质储层特征及孔隙演化
Characteristics and porosity evolution of relatively high-quality reservoirs of T3x 4 in Xinchang area,Sichuan,China
摘要
Abstract
The sandstone reservoir in T3 x4 (Member 4 of Upper Triassic Xujiahe Formation)of the Xinchang area is the important gas reservoir in the West Sichuan tight sandstone gas region.The relatively high-quality reservoir which more develops under the overall dense background is the important feature of this set of the sandstone.The research shows that the relatively high-quality reservoir generally appears in the medium-grained sandstone whose sorting is medium-good,it has less plastic sedimentary debris,its total content of cements,especially the carbonate cements are relatively low,but its siliceous cement content and authigenic kaolinite content are relatively high.The reservoir pore type is mainly the feldspar dissolution pore,and the primary intergranular pore is relatively less.Based on the research of the characteristics of the relatively high-quality reservoir,and by systematically researching the initial porosity of the reservoir,the compaction making the porosity loss,the dissolution increasing porosity and the cementation causing porosity loss,the authors recovered the porosity evolution process of the relatively high-quality reservoir in T3 x4 .The research shows that the compaction causes the T3 x4 reservoir pore loss rate reach 70% or more,and is the first important factor that makes reservoir properties get poor,the dissolution makes the contribution of around 3.49% to the T3 x4 reservoir pore and the cementation causes the T3 x4 reservoir pore loss rate to be around 6.28%.Under the common effect of the three kinds of action,the relatively high-quality reservoir of T3 x4 roughly entered the densification stage in the middle deposition of Penglaizhen Formation.The current porosity is about 8.9%.关键词
储层/致密砂岩/孔隙演化/须四段/新场地区Key words
reservoir/tight sandstone/porosity evolution/T3 x4/Xinchang area分类
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刘四兵,沈忠民,吕正祥,王鹏..四川新场地区须四段相对优质储层特征及孔隙演化[J].成都理工大学学报（自然科学版）,2014,(4):428-436,9.基金项目
国家自然科学基金资助项目 （）
