流花11-1油田礁灰岩油藏沉积-成岩演化模式

doi:10.11743/ogg20050420

Abstract

Abstract:

Two types of sedimentary facies(bioherm and organic bank) are developed in Liuhua 11-1 oilfield.They can be subdivided into 6 microfacies,including coralgal reef,coral reef,coralgal-coral reef,foraminiferal bank,bioclastic bank and coralgal debris-foraminiferal bank.Core observation and thin section analysis indicate that the diagenesis of reef complex in sea floor diagenetic environment,fresh water diagenetic environment and regional underground water-buried diagenetic environment include cohesion,dissolution,cementation,compaction-pressure solution,recrystallization,dolomitization and "chalkification",etc.Based on the results of sedimentary facies analysis and the effects of various stages of diagenesis on poroperm characteristics of reservoirs,the sedimentary-diagenetic evolution of reef limestone reservoirs are divided into 8 periods,i.e.the early reef formation,early exposure-dissolution,late reef formation,middle exposure-dissolution,early reservoiring,late dissolution,late reservoiring and regional groundwater dissolution periods.This unique evolution pattern constitutes vertically 8-layer reservoir architecture,including the alternating of 4 high porous and permeable layers and 4 medium-low porous and permeable layers.Cementation is considered a major diagenetic factor in the 4 medium-low porous and permeable layers,namely layers A,B₂,C and E,which are relatively tight and have widely developed intercalations.The layers B₁,B₃ and D,being in percolation environment,have been turned into high porous and permeable layers through dissolution,while the high porous and permeable layer F formed by further dissolution of regional groundwater is an aquifer.

Key words: sedimentary microfacies, diagenesis, evolution pattern, reef, reservoir, Liuhua 11-1 oilfield

CLC Number:

TE112.3

Yue Dali, Wu Shenghe, Lin Chengyan, Wang Qingru, Heng Liqun, Li Yan. Sedimentary and diagenetic evolution pattern of reef limestone reservoirs in Liuhua 11-1 oilfield[J]. Oil & Gas Geology, 2005, 26(4): 518-523,529.

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Sedimentary and diagenetic evolution pattern of reef limestone reservoirs in Liuhua 11-1 oilfield

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