Development and preservation mechanism of deep and ultra-deep carbonate reservoirs

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外文标题：Development and preservation mechanism of deep and ultra-deep carbonate reservoirs

外文摘要：Exploration practice has proved that deep and ultra-deep reservoirs consist of mainly matrix-porous dolomite reservoirs and fractured-vuggy karst reservoirs and still will be very important targets for future exploration,in which large oil and gas fields such as Anyue,Yuanba,Halahatang,Fuman and Shunbei have been discovered.This paper systematically summarizes three theoretical and technical achievements in studying deep and ultra-deep carbonate reservoirs in the past decade.(1)The micro-zone and multi-parameter experiment analysis technology featured by determining the"age,temperature,pressure and fluid properties"of carbonate reservoirs,together with experimental simulation of cross-tectonic-period pore formation and preservation featured by the"multi-stage,continuous,visualized and online detection technology",providing useful tools for studying the pore formation and preservation mechanism of deep and ultra-deep carbonate rocks from the perspective of"forward"and"inversion".(2)Deep and ultra-deep matrix-porous dolostone reservoirs are still controlled by sedimentary facies,among which reef(mound)and/or beach contribute most.The reservoir space is mainly composed of sedimentary primary pores and supergene dissolution pores and fractures,though some of reservoir spaces are formed by burial dissolution and they tend to develop and may locally concentrate following the pre-existing porous zone.In other words,burial dissolution vugs are inherited rather than newly formed.Early dolomite precipitation(or dolomitization)has a high potential to preserve early pores.(3)The development and preservation mechanism of fractured-vuggy karst limestone reservoirs in deep and ultra-deep realm was analyzed.Pene-contemporaneous dissolution and interlayer and buried-hill karstification control the development of early and late supergene fractured-vuggy reservoirs.Strike-slip faults superimposed with supergene karstification lead to the development of"fence-style"faulted karst reservoirs.Dissolution simulation experiments reveal that the development of karst fractured-vuggy reservoirs is facies-controlled in certain degree,mainly developed in packstone.Rock mechanics analysis reveals that the preservation of caves is under the control of lithology,cave size,and the distance to the unconformity,and caves can be well preserved at 10,000 m.The theoretical and technical achievements provide supports for carbonate oil and gas exploration into ten thousand meters deep.

外文关键词：

Deep and ultra-deep formationCarbonate reservoirsMatrix-porous dolomite reservoirFractured-vuggy karst reservoirGenersis and distribution of carbonate reservoirs

作者：

Anjiang SHEN、Anping HU、Zhanfeng QIAO、Jianfeng ZHENG、Min SHE、Liyin PAN

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作者单位：

Key Laboratory of Carbonate Reservoir,CNPC,Hangzhou 310023,China

State Energy Key Laboratory of Carbonate Oil and Gas,Hangzhou 310023,China

PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China

关键词：

Deep and ultra-deep formation Carbonate reservoirs Matrix-porous dolomite reservoir Fractured-vuggy karst reservoir Genersis and distribution of carbonate reservoirs

出版年：

2024

DOI：

10.1007/s11430-023-1417-8

中国科学:地球科学(英文版)

中国科学院

中国科学:地球科学(英文版)

影响因子：1.002

ISSN：1674-7313

年,卷(期)：2024.67(11)