| This dissertation researches on sedimentary facies characteristics, reservoirrockcharacteristics, reservoir physical characteristics and reservoir oil and gasbearing bymeans of reservoir geology, reservoir sedimentology of carbonate rocks, petroleumgeology. This is based on previous studies, ordinary and cast thin sections and testanalysis on samples from field outcrops combined with field and indoor information,macro and micro observation.The deposition pattern is relatively simple, only including restricted platform,open platform and platform margin. Restricted include platform face and shallows;open platform include intraplatform shallow only. platform margin include platformface and the middle of the beach.Research shows that the rock types are grain dolomite, particle dolomite andalgae dolomite. The main type of the pore is produced in grain dolomite. pressuresolution, fracture diagenesis and issolution are the main beneficial to diagenesis forreservoir space. Cementation is negative to reservoir space.Because loushanguan formation is ancient strata, the multi-stages of tectonicmovement and complex diagenesis. Combine observation study thin sections from,the paper consider that sequences of diagenesis of loushanguan formation isdolomitization submarine of penecongtemporneous–cementation-meteoritic watercorrosion-cementation-shallow buried of diagenesis environment-recrystallization–cementation-the early of disruption-middle buried of diagenesisenvironment-dolomitization-non selective dissolution-fracture diagenesis-metasomatism-cementation and filling. In the early diagenesis of environment ofmeteoritic water, there is the dedolomitization reaction of dolomite and dissolution.The after of sedimentary is divided5stages, the main type is pressure solutionand compaction, dolomitization, dissolution, recrystallization, fracture diagenesis etc. according to the effect of the reservoir, it is divided positive, negative andpositive-negative. |
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