鄂尔多斯盆地南部彬长区块上石盒子组7段储层识别与预测

doi:10.11743/ogg20210510

Abstract

Abstract:

The 7^th member of Upper Palaeozoic Shihezi Formation (He 7 Member), is a new favorable play for gas exploration in Binchang block, southern Ordos Basin.However, the reservoir prediction and selection of exploration targets therein have become quite hard given multiple factors including thin reservoir, rapid change of lithology, strong heterogeneity, and low signal-to-noise ratio and resolution.The exploration progress, thus, has been severely restricted.The study aims to improve the accuracy of sweet spot prediction and the success rate of natural gas exploration in the study area.A progressive prediction technique from "configuration, attribute to inversion" is proposed regarding reservoir characteristics therein.The results indicate that the internal reflection configuration of intervals with well-developed sand bodies is defined through seismic response characteristic analysis together with seismic forward modeling, the sensitive elastic parameters of sand bodies are clarified by petrophysical analysis; the channel shapes are characterized effectively by neural network clustering of reflection configuration in frequency domain; and the sand body thickness is predicted accurately with Bayesian stochastic inversion.Moreover, the sweet spots in the reservoir are identified by gas-bearing potential prediction.Under the influence of paleogeomorphology, there are a total of 4 SW-NE-striking channel sand bodies of strip-shaped distribution identified in the Upper Palaeozoic He 7 Member in the south of Binchang block, which are the favorable play fairways in exploration.While the channel sand bodies to the east are in isolated and scattered distribution.In practice, the targets selected under the guidance of the technique are proved to be high in quality by drilling.The lateral resolution of seismic prediction is high, serving for reflecting the change features of the channels and channel sand bodies truthfully.The sweet spot prediction in tight and thin sandstone reservoirs of strong heterogeneity can, thereby, be solved effectively, which is of guiding significance to future exploration and development.

Key words: reflection configuration, neural network waveform clustering in frequency domain, Bayesian stochastic inversion, gas-bearing potential prediction, He 7 Member, Binchang block

CLC Number:

TE122.2

Ling Liu, Linlin Wang, Jiang Wu, Xia Chen, Jiaqi Yang. Reservoir identification and prediction of He 7 Member in Binchang block, southern Ordos Basin[J]. Oil & Gas Geology, 2021, 42(5): 1124-1135.

Figures/Tables 10

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[1]	Li Zhiming, Tao Guoliang, Li Maowen, Qian Menhui, Xie Xiaomin, Jiang Qigui, Liu Peng, Bao Yunjie, Xia Dongling. Discussion on prospecting potential of shale oil in the 3^rd sub-member of the Triassic Chang 7 member in Binchang block,southwestern Ordos Basin [J]. Oil & Gas Geology, 2019, 40(3): 558-570.
[2]	Fan Jiuxiao, Li Xiaowei, Yuan Chunyan, Wang Shanming. Application of 90° phase rotation technique in reservoir prediction:A case study from the Chang8¹ reservoir in Binchang block,Ordos Basin [J]. Oil & Gas Geology, 2016, 37(2): 286-290.

Reservoir identification and prediction of He 7 Member in Binchang block, southern Ordos Basin

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