中坝气田须二气藏致密砂岩储层特征及开发潜力再认识

Abstract

Abstract:

The tight-sandstone gas reservoir in Zhongba gas field is a fracture-pore type reservoir controlled by structures and fractures. On the basis of analyzing the basic characteristics of reservoirs, the factors controlling the fractures are discussed to figure out the effect of fractures distribution on the formations and predict the distribution of residual gas. The reservoir is mainly composed of light gray-gray fine-medium lithic feldspar quartz sandstone with its average porosity and permeability being 6.29 % and 0.19×10 ^-3 μm ², respectively. It belongs to low porosity and permeability formations. And based on this, the fracture was studied by means of tectonic curvature method and rock mechanics experiment. The results showed that the fractures on the surface were mainly developed along the structural axis and close to the southeast arc and the northern conjunction of the saddle. The developments of fractures were tightly related with lithology. Combined with the numerical simulation results of gas reservoir, the potentials of the gas reservoir are analyzed to support the scheme adjustment in the next stage of development.

Key words: tight sandstone, fracture-pore, fracture distribution, structural curvature method, rock mechanics, development potential

CLC Number:

TE122

ZHANG Benjian,WANG Xingzhi,ZHANG Chuyue,WANG Xuli,SANG Qin. Recognition of tight sandstone reservoir characteristics and development potential of the 2nd member of Xujiahe gas reservoir in Zhongba Gas Field[J].Reservoir Evaluation and Development, 2019, 9(6): 10-15.

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References 23

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编号	井号	深度/ m	密度/ （g·cm^-3）	孔隙度/ %	渗透率/ 10^-3 μm²	岩性	单轴抗压强度（UCS）/MPa	弹性模量/MPa	泊松比	脆性指数	脆性描述
1	45井	2 588.82~2 588.91	2.46	7.17	0.06	石英砂岩	75.10	25 739	0.305 3	44	极高
2	45井	2 593.88~2 593.95	2.47	7.29	0.17	石英砂岩	54.07	21 157	0.247 8	22	脆性
3	45井	2 616.06~2 616.13	2.49	5.99	0.04	石英砂岩	97.58	38 274	0.208 5	39	高
4	45井	2 621.76~2 621.83	2.52	5.76	0.04	石英砂岩	74.92	21 917	0.171 3	32	高
5	46井	2 294.00	2.28	7.52	0.04	长石岩屑砂岩	39.57	13 039	0.348 1	13	中度
6	46井	2 301.76	2.29	13.55	2.28	长石岩屑砂岩	42.19	12 009	0.217 1	10	中度
7	46井	2 302.35	2.28	13.34	2.50	长石岩屑砂岩	46.09	12 110	0.283 7	10	中度
8	46井	2 424.00	2.40	9.14	0.19	长石岩屑砂岩	58.51	21 427	0.187 0	14	中度
9	46井	2 587.00	2.62	3.16	0.01	岩屑长石石英砂岩	112.86	34 197	0.142 3	37	高
10	46井	2 613.00	2.64	1.67	0.01	岩屑石英砂岩	119.98	30 095	0.136 0	25	脆性

Recognition of tight sandstone reservoir characteristics and development potential of the 2nd member of Xujiahe gas reservoir in Zhongba Gas Field

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