Diagenesis in Carbonate Reservoir and Pore Structure Characteristic from the Ordovician Ma51 Sub-member Reservoir in the Northern Jingbian Gasfield
Received date: 2015-05-30
Revised date: 2015-09-15
Online published: 2015-12-10
Original deposition is dominated by micrite in carbonate reservoir in Jingbian Gasfield.Its physical property is poor and can′t become a reservoir.The reservoir property is mainly influenced by the late complex diagenesis,so the reservoir has gone through different diagenesis with different pore structure and is hard to predict favorable reservoir.In this paper,casting thin sections,scanning electron microscope,cathodoluminescence imaging,physical properties,high pressure mercury injection and other analytical testing methods were used to analyze the diagenesis and micro-pore structure of the reservoir in Ma51 sub-member reservoir from the northern Jingbian Gasfield.This study shows that,reservoir mainly experienced mechanical compaction and pressure solution,cementation filling,dissolution and metasomatism.And formed four types of reservoirs,namely dolomite-quartz-kaolinite cementation-dissoved pore type(Ⅰclass),dolomite-calcite-quartz cementation- dissoved pore type(Ⅱclass),dolomite+calcite cementation-intercrystalline pore type(Ⅲclass),and calcite cementation-dense reservoir type(Ⅳclass).ClassⅠreservoir is the most favorable reservoir because its pore type is single,pore throat sorting is better,effective throat volume ratio is large,drainage capillary pressure and median capillary pressure is low.Class Ⅳreservoir is the worst reservoir because its large-medium pore is filled by calcite,and pore throat has no permeability.
WEI Li，WANG Zhen-liang，FENG Qiang-han，WANG Yong . Diagenesis in Carbonate Reservoir and Pore Structure Characteristic from the Ordovician Ma51 Sub-member Reservoir in the Northern Jingbian Gasfield[J]. Natural Gas Geoscience, 2015 , 26(12) : 2234 -2244 . DOI: 10.11764/j.issn.1672-1926.2015.12.2234
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