Study on Sedimentary Microfacies Characterization Method in Sparse Well Block with Progressive Extension

doi:10.3969/j.issn.1006-6535.2022.06.007

Abstract

Abstract: In view of the low degree of well control in the sparse well block around the development area and the great gap between the accuracy of sediment characterization and the existing development area, the differences were analyzed in sandstone thickness and seismic impedance of different sedimentary microfacies, the statistics was made for the sandstone parameters of different sedimentary microfacies in the development area, and the sandstone database was established in correspondence to different microfacies; based on the control range of fan spreading on the plane predicted by seismic attributes, the development characteristics of sedimentary sand bodies in sparse well block characterized by seismic inversion were analyzed by microfacies knowledge base, and the microfacies types of sand bodies were determined; the quantitative characterization of sedimentary microfacies in sparse well block can be implemented by taking the extension range of sand bodies parallel and vertical to sediment origins as microfacies distribution range. The study shows that The development characteristics of sand bodies in different sedimentary microfacies can be effectively characterized by single sand body thickness, cumulative probability, inverse wave impedance and other parameters of braided river delta microfacies in the dense well pattern area of Block A, among which underwater distributary channel and channel mouth bar were obviously advantaged in sandstone parameters. The microfacies characterization method based on the microfacies knowledge base and seismic attribute prediction can effectively improve the accuracy of sedimentary microfacies characterization in the sparse well block, with a coincidence rate up to 91%. The favorable microfacies types in the sparse well block are mainly distributed in Well Blocks A5 and A02. The study results have been applied to the evaluation, deployment and scheme implementation of sparse well block with progressive extension around Block A, and achieved excellent results, with a cumulative production capacity of 2.35×10⁴t and proved reserves of 200×10⁴t. The study results provide strong support for stimulation and stable production of old oilfields.

Key words: Sparse well block, sedimentary microfacies, microfacies knowledge base, seismic inversion, braided river delta

CLC Number:

TE121.1

Nan Jinhao, Sha Zonglun, Jia Hongbing, Liu Shaoran, Xiong Xiangdong, Lin Tong. Study on Sedimentary Microfacies Characterization Method in Sparse Well Block with Progressive Extension[J]. Special Oil & Gas Reservoirs, 2022, 29(6): 56-64.

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