摘要
台缘滩是飞仙关组储层发育的优势相带,而同样位于台缘带的普光主体、大湾-毛坝地区飞仙关组储层发育分布存在明显差异。若要进一步完善飞仙关组储层发育分布机理,明确普光地区飞仙关组不同区域的储层差异发育分布规律及其控制因素则是亟待解决的关键问题。文中运用岩石学、沉积学、层序地层学,围绕不同区域储层差异分布规律及其控制因素,取得以下认识:1)普光地区飞仙关组储集岩主要为(残余)鲕粒白云岩、(残余)砂屑白云岩、细—中晶白云岩,储集空间主要为粒间(溶)孔、粒内溶孔/铸模孔、晶间(溶)孔、溶洞。2)普光主体地区颗粒滩储层连续发育,粒内溶孔占比较高,达到53.8%;大湾-毛坝地区储层厚度相对较小,粒内溶孔占比较低,约为17.7%。3)优质储层的形成主要与颗粒滩沉积、准同生溶蚀作用、白云岩化作用有关。4)台缘滩储层差异发育受控于古地貌,古地貌控制下的滩相沉积差异提供了储层差异发育的基础,受古地貌和沉积影响的准同生溶蚀作用增大了储层差异发育,准同生白云岩化作用进一步增大了区域储层差异发育。
The platform margin shoal is the dominant facies for reservoir development in the Feixianguan Formation.It has been found that there are significant differences in the distribution of reservoirs in the main Puguang area and the Dawan-Maoba area located on platform margin shoal as well.In order to further improve the understanding of the differential development and distribution mechanism of reservoirs,it is crucial to study the differential development and distribution patterns of reservoirs in different areas of Puguang area and their controlling factors.As for the problems,petrology,sedimentology,and sequence stratigraphy were used to gain the following insights:(1)the reservoir rock types in the Feixianguan Formation of Puguang area are residual oolitic dolomite,residual doloarenite,and fine to mesocrystalline dolomite.The types of reservoir spaces in the Feixianguan Formation are intergranular(dissolved)pores,intragranular dissolved pores,intercrystal(dissolved)pores,and karst caves.(2)In the main Puguang area,the grain shoal reservoir in the Feixianguan Formation develops continuously and the proportion of intragranular dissolved pores is relatively high(53.8%),while the reservoir thickness of the Feixianguan Formation in Dawan-Maoba area is relatively thin,and the proportion of intragranular dissolved pores is relatively low(17.7%).(3)The formation of high-quality reservoir is mainly related to grain shoal deposition,penecontemporaneous dissolution and dolomitization.(4)The differential development and distribution of reservoirs in the platform margin are controlled by paleogeomorphology.The variation in grain shoal deposition,influenced by paleogeomorphology,provides the basis for the differential development of reservoirs.The penecontemporaneous dissolution,influenced by paleogeomorphology and deposition,increases the differential development of reservoirs.The penecontemporaneous dolomitization enhances further the regional differential development of reservoirs.
作者
杨伟强
吕立爽
周艳娜
任杰
徐静
杨玉平
王璇
张雪松
YANG Weiqiang;LYU Lishuang;ZHOU Yanna;REN Jie;XU Jing;YANG Yuping;WANG Xuan;ZHANG Xuesong(Exploration and Development Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang 457001,China;College of Geosciences,China University of Petroleum,Beijing 102249,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2023年第6期954-962,共9页
Fault-Block Oil & Gas Field
关键词
普光地区
飞仙关组
台缘滩
准同生溶蚀作用
白云岩化作用
Puguang area
Feixianguan Formation
platform margin shoal
penecontemporaneous dissolution
dolomitization
