普光地区长兴组生物礁储层分布预测

doi:10.11720/wtyht.2020.1132

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Abstract

There is a promising exploration potential in Changxing Formation of Puguang area,northeastern Sichuan Basin.In this paper,the authors made a comparison of the growth pattern of reef between Puguang area and Yuanba area,conducted an analysis of the geological features of reef and reservoir and drew a summary on vertical and horizontal distribution law of reef dolomite reservoir.On such a basis,a reef seismic forward model was established to obtain the identification mode of seismic facies using logging and seismic data.In order to avoid the interference from marly limestone,the authors predicted favorable sedimentary facies belt of reservoir growth using palaeogeomorphology analysis and picked an appropriate time window for reservoir prediction.Finally,the authors used seismic facies reading,attributive analysis and wave impedance inversion to accurately predict the effective reservoir distribution.So a seismic prediction method for reef reservoir in Puguang area was established and the reef reservoir distribution in Puguang area was predicted quantitatively.The prediction result indicates that the reservoirs mainly occur on the reef cap in vertical dimension and on a narrow belt along the platform margin in horizontal dimension.Meanwhile,the congruence between prediction result and well data confirms the effectiveness of the proposed method.

Key words： reef reservoir prediction Changxing Formation Puguang area Sichuan Basin

Received: 12 March 2019 Published: 03 March 2020

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	Articles by authors
	Da JIN
	Hao-Kun DU
	Fan-Bing MENG
	Guang-Sheng QIN
	Yun SU
	Na LI

Cite this article:

Da JIN,Hao-Kun DU,Fan-Bing MENG, et al. The prediction of reef reservoir distribution in Changxing Formation of Puguang area[J]. Geophysical and Geochemical Exploration, 2020, 44(1): 50-58.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1132 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I1/50

Deposition facies diagram of Changxing Formation in Puguang ares

Geologic feature of reef reservoir in Puguang area

Rock physics parameter of reef geologic model

Forward modelling of reef in Puguang area
a—organic reef geological model;b—the forward section;c—the actual profile

Palaeogeomorphic map of Puguang area in late Changxingian

Maximum trough amplitude on the top Changxing formation in Puguang area

Impedance profile through Well f2

Reef reservoir thickness map of Changxing formation in Puguang area

Reef reservoir probability plot of Changxing Formation in Puguang area

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