Prediction of Gas Bearing Property in Seismic Frequency Domain for Coal Beds in Dacheng Swell

doi:10.7657/XJPG20200406

Abstract

Abstract:

The coal bed in Dacheng swell is characterized by large lateral variation of gas-bearing property and strong anisotropy. Aquifer has been penetrated in partial newly-drilled wells so that detailed prediction of gas-bearing property needs to be performed for the coal bed. During multi-well multi-frequency forward modeling and seismic spectrum analysis, it is found that frequency is sensitive to coalbed methane, so wavelet decomposition and Fourier transform are used to calculate high/ow frequency tuning energy ratio for gas bearing prediction. Based on the statistical analysis of the tuning energy ratio of multi-well near-well seismic, drilling and production data, the standards for gas-bearing property division with tuning energy ratio are established. According to which the VI coal bed of Taiyuan formation in the study area is divided into three types of favorable gas-bearing areas, and the coincidence rate of the predicted results with the actual drilling data reaches 88.9%, showing a good effect. This method breaks through the traditional qualitative prediction in 2D work area, which can be a guidance for production deployment in coalbed gas wells and is worth promoting and applying in similar areas.

Key words: Bohai Bay basin, Dacheng swell, 2D seismic, coal bed, gas bearing property, frequency domain, tuning energy ratio, favorable area prediction

CLC Number:

P631.414

WANG Yunpeng, SU Ri, MAO Chuanlong, GUAN Xiaoqu, LI Guangye. Prediction of Gas Bearing Property in Seismic Frequency Domain for Coal Beds in Dacheng Swell[J]. Xinjiang Petroleum Geology, 2020, 41(4): 422-429.

Figures/Tables 12

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Table 1

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井名	含气/含水性预测	试采日产量/m³	高低频调谐能量比	预测符合情况
D8井	含水	288.00（水）	0.69	符合
D10井	含水	74.36（水）	0.74	符合
DC1井	低含气	547.00（气）	0.71	不符合
DS1井	含水	3.96（水）	0.81	符合
G8井	含气	177.60（水）	0.65	符合
Sheng1井	含气	干层	0.64	符合
D2井	可凝气层	未测试	0.84	符合
D3井	可凝气层	15.50（水）	0.86	符合
D4井	可凝气层	未测试	0.67	符合
D5井	气浸	未测试	0.68	符合
D9井	含水	42.23（水）	0.63	不符合
DP1井	含水	110.00（水）	0.76	符合
DP3井	含气	1 325.00（气）	0.56	符合
DT2井	高含水	未测试	1.00	符合
DT4x井	含气	未测试	0.62	符合
DT6井	含气	2 898.00（气）	0.61	符合
DT7井	含气	2 898.00（气）	0.53	符合
DT9井	含气	未测试	0.56	符合