多层系致密砂岩气藏水平井开发适应性评价

doi:10.7657/XJPG20220314

摘要/Abstract

摘要：

对于神木气田多层系气藏,若水平井开发地质目标选择不当,会降低储量动用程度和经济效益。研究神木气田储集层砂体发育规模及叠置模式,采用剖面储量集中度概念,建立单层式、双层式和多层式气藏模型。以水平井增产倍比作为经济效益评价依据,评价多层系气藏水平井开发储集层界限。研究表明：神木气田下二叠统太原组及山西组二段局部发育较大规模复合有效储集层,有效厚度为6.0~9.0 m,长度为1 600~3 200 m,储量集中度大于75%,主产层与次产层渗透率比值为0.8~3.9,具备水平井开发的最佳储集层条件。

关键词: 神木气田, 多层系致密气藏, 储量集中度, 砂体叠置模式, 水平井开发, 物性界限, 增产倍比, 经济效益

Abstract:

For multi-layer gas reservoirs in the Shenmu gas field, improper selection of geological targets for horizontal well development may lead to the problems such as poor economic benefits and unrecovered reserves. The development scale and stacking patterns of sand bodies in these multi-layer gas reservoirs were investigated, and the single-layer, double-layer and multi-layer gas reservoir models were established by adopting the concept of reserves concentration. Taking the horizontal well stimulation ratio as the basis for economic benefit evaluation, the reservoir limit of horizontal well development in multi-layer reservoirs was evaluated. The research shows that large-scale composite effective reservoirs are locally developed in the Lower Permian Taiyuan formation and the second member of the Lower Permian Shanxi formation in the Shenmu gas field, with an effective thickness of 6.0-9.0 m and a length of 1 600-3 200 m. These intervals satisfy the optimal reservoir conditions for horizontal well development, namely the reserves concentration greater than 75% and the permeability ratio of the dominant layer to the secondary producing layer ranging from 0.8 to 3.9.

Key words: Shenmu gas field, multi-layer tight gas reservoir, reserves concentration, sand body stacking pattern, horizontal well development, physical property limit, stimulation ratio, economic benefit

中图分类号:

TE375

刘姣姣, 王德龙, 刘倩, 汤敬. 多层系致密砂岩气藏水平井开发适应性评价[J]. 新疆石油地质, 2022, 43(3): 354-359.

LIU Jiaojiao, WANG Delong, LIU Qian, TANG Jing. Evaluation on Adaptability of Horizontal Well Development to Multi-Layer Tight Sandstone Gas Reservoirs[J]. Xinjiang Petroleum Geology, 2022, 43(3): 354-359.

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层位	砂体类型	厚度/m	平均厚度/m	宽度/m	长度/m
山一段	单砂体	0.5~4.5	2.5	200~600	400~1200
山一段	复合砂体	4.0~12.0	6.5	500~1 200	1 000~2 200
山二段	单砂体	0.8~6.5	3.5	400~1 000	600~1 600
山二段	复合砂体	4.0~12.0	6.0	800~2 000	1 800~3 200
太原组	单砂体	0.6~5.0	2.8	400~1 000	500~1 400
太原组	复合砂体	4.0~15.0	7.1	800~1 800	1 600~2 800

模型类型	层	有效厚度/m	孔隙度/ %	渗透率/ mD	含气饱和度/%	储量集中度/%
多层式	层 1	5.0	7.4	0.40	59.65	33.3
	层 2	5.0	8.1	0.46	62.39	33.4
	层3	5.0	6.8	0.34	57.87	33.3
双层式	层 1	2.2	7.4	0.40	59.65	15.0
	层 2	7.2	8.1	0.46	62.39	45.0
	层3	5.6	6.8	0.34	57.87	40.0
单层式	层1	2.0	7.4	0.40	59.65	12.0
	层2	11.0	8.1	0.46	62.39	75.0
	层 3	2.0	6.8	0.34	57.87	13.0