摘要
川东北地区开江—梁平海槽两侧的飞仙关组储层有着明显的差异。海槽东北侧储层主要由次生孔隙发育的鲕粒白云岩组成,厚度大、分布广和质量好;海槽西南侧储层主要由次生孔隙欠发育的鲕粒灰岩构成,虽然厚度大、分布广,但质量较差,仅局部分布有良好的透镜状白云岩储层。这些储层的形成与演化主要受到沉积和成岩作用的共同影响。其中沉积作用是储层形成的基础,决定了储层的大致分布范围,最有利于储层形成的沉积相带为台地边缘滩,多沿孤立台地边缘呈环带状或连陆台地呈带状分布;成岩作用是储层形成的关键,最有利于储层形成的成岩作用是混合水白云石化和埋藏溶解作用。
There is obvious difference in reservoir characteristics on both sides of the Kaijiang-Liangping trough in the northeast Sichuan basin. The reservoir on the northeastern side of the trough is mainly dominated by oolith dolomite of good reservoir quality, which is abundant in secondary pores, thick and extensively distributed. The reservoir on the southwestern side of the trough mainly consists of oolith limestone, which is thick and extensively distributed but with poor reservoir quality; good lenticular dolomite reservoir only distributes in some limited areas. The formation and evolution of this kind of reservoirs are mainly controlled by the effect of the sedimentation and diagenesis. Sedimentation is the basis; it determines the final distribution form, scope and spatial characteristics of the reservoir. Platform margin beach is the most favorable facies belt for the formation of reservoir. The beach is located in the region of isolated platform or of connected platforms in zonal distribution. Diagenesis is the key to good reservoir formation and evolution. The most favorable diagenesis for reservoir formation and evolution is the burial dissolution and the mixed dolomitization.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2008年第1期117-122,共6页
Earth Science Frontiers
基金
教育部"新世纪优秀人才支持计划"项目(NECT-04-0911)
四川省重点建设学科建设项目(SZD0414)
关键词
川东北地区
飞仙关组
海槽
储层
控制因素
northeastern Sichuan basin
Feixianguan formation
trough
reservoir
control factors
