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四川元坝地区须二段致密砂岩储层孔隙演化与天然气成藏
引用本文:王威.四川元坝地区须二段致密砂岩储层孔隙演化与天然气成藏[J].成都理工大学学报(自然科学版),2012,39(2):151-157.
作者姓名:王威
作者单位:中国石化勘探南方分公司,成都,610041
基金项目:国家科技重大专项(2011ZX05002-004)
摘    要:利用储层中不同碎屑颗粒、填隙物的定量统计和孔隙在压实作用下的定量演化分析以及储层中包裹体均一温度,结合储层埋藏史分析等方法,探讨了四川盆地元坝地区上三叠统须二段致密砂岩储层孔隙演化与天然气成藏的关系。早成岩阶段结束时,储层的孔隙度已经降至8.7%,致密储层业已形成,此后一系列的胶结作用导致原生孔隙进一步减少,非均质性强。而元坝地区须二段天然气大规模充注时间为中成岩A期,此时储层已经致密,总体反映出"储层先致密,天然气后成藏"的特点,天然气在储层中以"活塞式推进"方式运移,气藏富集主要受源岩的生烃强度、优质储层等因素控制。基于此,认为烃源岩生气强度高的元坝东凹陷区,同样可以作为天然气勘探有利区。

关 键 词:孔隙演化  天然气成藏  须二段  元坝地区

Pore evolution and gas accumulation in tight sandstone reservoir of Member 2 of Xujiahe Formation in Yuanba area of Sichuan, China
WANG Wei.Pore evolution and gas accumulation in tight sandstone reservoir of Member 2 of Xujiahe Formation in Yuanba area of Sichuan, China[J].Journal of Chengdu University of Technology: Sci & Technol Ed,2012,39(2):151-157.
Authors:WANG Wei
Institution:WANG Wei Exploration Southern Company of SINOPEC,Chengdu 610041,China
Abstract:Based on the quantitative statistics of the clastics and matrixes in the reservoir and quantitative evolutional analysis of pores,and according to the homogeneous temperature of inclusions and buried history of the reservoir,this paper makes an approach to the pore evolution and the natural gas accumulation in the tight sandstone reservoir of Member 2 of Xujiahe Formation(T3x2) of Upper Triassic in the Yuanba area of Sichuan Basin.The dynamic recovery of the compacted history of the reservoir is achieved.In the early diagenetic stage,the porosity of the reservoir declined to 8.7%,meanwhile,the tight reservoir formed.Following this,a series of cementations made the primary pores decreasing.The anisotropy is heightened,too.It can be known that the gas filling time of T3x2 in the Yuanba area is in the middle diagenetic stage A when the reservoir was tightened.Totally,"first is the compaction of reservoirs,and second is natural gas accumulation".The gas moves by "piston type advancing" in the reservoir.So the gas concentration is controlled by hydrocarbon-generating intensity and high quality reservoirs.Therefore,the depressed area in the eastern of Yuanba can be regarded as a favorable area for gas exploration.
Keywords:pore evolution  natural gas accumulation  Xujiahe Formation  Yuanba  Sichuan
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