Abstract
To predict distribution of diagenetic stages of Xihu Sag Huagang Formation sandstone reservoir and secondary pore development zone, and research original pore reservation and secondary pore increase and decrease in reservoir evolution process, combining traditional diagenesis research and numerical simulation technique, and based on interaction model and effect model, this paper establishes a aggregative model on numerical simulation of diagenetic stages. In diagenesis simulation process, based on process response principle, and restricted by current diagenetic stage distribution and type, diagenetic stage distribution and type of reservoir during geological historical evolution period is back stripped through diagenetic temperature. Taking single well diagenetic stage data as constraint condition, and combining with research area burial history, ground temperature history, and diagenetic stage division basis, and scheme, plane distribution of diagenetic stages of the whole research area during each geological historical period is finally obtained.
Highlights
The evolution of reservoirs pore is mainly controlled by diagenesis and sedimentary facies, where sedimentary facies affects pore evolution at shallow and deep buried depth, respectively [1,2,3]
Clastic rock diagenetic stage represents different geological historical evolution stages experienced by clastic sediment under all kinds of diagenesis transformation after deposition to the period before metamorphism [7]
Whether hydrocarbon source rock generates hydrocarbon is closely concerned with diagenetic stages, and post mature hydrocarbon source rock (Ro>1.3%) is generally unbeneficial to oil gas generation, and research on diagenetic stages of research area contributes to beneficial oil-gas exploration area finding [8, 9]
Summary
The evolution of reservoirs pore is mainly controlled by diagenesis and sedimentary facies, where sedimentary facies affects pore evolution at shallow and deep buried depth, respectively [1,2,3]. Clastic rock diagenetic stage represents different geological historical evolution stages experienced by clastic sediment under all kinds of diagenesis transformation after deposition to the period before metamorphism [7]. Diagenetic stage of clastic sediment in burial stage is closely concerned with oil and gas accumulation property of clastic pore development and evolution to reservoir stratum. Diagenesis and pore evolution affect pore formation, increase and decrease of oil and gas reservoir stratum, and affect primary pore preservation, secondary pore distribution and pore connection and penetration property. Diagenesis and pore evolution have basic effect on quality of reservoir, and in research on diagenesis of reservoir, it is necessary to divide diagenesis stage and pore evolution stage of research area
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