Identification and Productivity Prediction of High-Quality Reservoirs in the Metamorphic Buried Hills of the Bozhong 19-6 Structure

doi:10.7657/XJPG20250107

Abstract

Abstract:

In the Bozhong 19-6 structure, fractures serve as the primary flow channels and storage spaces in the metamorphic buried-hill reservoirs, significantly controlling the formation of high-quality reservoirs and well productivity. To accurately identify high-quality reservoirs in the Bozhong 19-6 structure and predict their productivity, fractures were quantitatively characterized using thin sections, imaging logs, and other data. Based on the division of vertical structural units within the buried-hill reservoirs, high-quality reservoirs in the target intervals were identified using conventional mud log, wireline and imaging logging data. The reservoirs were finely evaluated by introducing fracture development index and comprehensive index methods and then a comprehensive method for identifying high-quality reservoirs was established. By substituting the effective thickness and fracture parameters of the high-quality reservoir into productivity evaluation equation, the gas layer productivity of the target intervals was calculated and compared with the test results. It is found that the relative error between the predicted productivity index per meter and the actual productivity values is less than 15%, which indicates a high feasibility of this comprehensive evaluation method in identifying high-quality reservoirs in metamorphic buried hills. This study offers a guidance for oil and gas development in the metamorphic buried hills in the Bozhong 19-6 structure.

Key words: Bozhong 19-6 structure, metamorphic buried-hill reservoir, fracture characteristic, reservoir identification, productivity prediction

CLC Number:

TE122

TAN Zhongjian, GUO Kangliang, WU Liwei, ZHANG Guoqiang, LI Hongru, DENG Jinhui, BI Hongri. Identification and Productivity Prediction of High-Quality Reservoirs in the Metamorphic Buried Hills of the Bozhong 19-6 Structure[J]. Xinjiang Petroleum Geology, 2025, 46(1): 57-63.

Figures/Tables 8

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Table 1.

Table 2.

Table 3.

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储集层类型	录井特征	常规测井特征	成像测井特征	阵列声波特征
裂缝-孔隙型储集层	钻时和地层可钻性指数降低，气测全烃值显著上升	低密度，高声波时差，高补偿中子，低电阻率	次生孔隙较发育，沿暗色正弦曲线见黑斑分布，成像图整体偏暗，孔隙度谱形态宽且居于右侧	各向异性不显著
孔隙-裂缝型储集层	钻时和地层可钻性指数降低，气测全烃值显著上升	低密度，高声波时差，高补偿中子，较低电阻率	裂缝较发育，有暗色正弦曲线显示，有黑斑分布，孔隙度谱形态较宽且居于中间	各向异性较显著
裂缝型储集层	钻时和地层可钻性指数降低，气测全烃值显著下降	较高密度，较低声波时差，较高电阻率	裂缝成组发育，有暗色正弦曲线显示，孔隙度谱形态窄且居于左侧	各向异性显著

储集层类型	录井特征	常规测井特征	裂缝发育指数	综合指数
优质储集层	地层可钻性指数较小；气测全烃值为高值	双侧向电阻率为正差异，电阻率出现高背景下低阻，声波时差和补偿中子较高，密度较小	<0.5	>0.3
无效储集层	地层可钻性指数较大；气测全烃值为低值	双侧向电阻率为负差异，电阻率为高阻，声波时差和补偿中子较低，密度较大	>0.5	<0.3

井名	裂缝密度/ （条·m^-1）	裂缝孔隙度/ %	储集层渗透率/ mD	米采气指数/ （m³·d^-1·MPa^-1·m^-1）
渤中19-6-D井（测试段1）	1.14	0.110	0.190 000	58.194
渤中19-6-D井（测试段2）	1.85	0.280	0.440 000	124.472
渤中19-6-B井	1.03	0.013	0.000 730	24.106
渤中19-6-E井	0.32	0.024	0.001 970	2.799
渤中19-6-C井	0.21	0.007	0.000 095	0
渤中19-6-F井	0.20	0.009		0