苏里格气田西南部致密砂岩气藏资源评价方法及评价参数的影响因素

doi:10.11743/ogg20200407

Abstract

Abstract:

The research on reservoir characteristics and their impact on resource assessment is one of the bases for tight gas resource evaluation, production and efficient development.An integration of analyses of logging data, hydrocarbon generation conditions and production data, as well as thin section observation, is applied to investigate the reservoir characteristics, the distribution, thickness and superposition pattern of sand bodies in He 8 member and Shan 1 member in southwestern Sulige gas field, to select an applicable evaluation method according to the reservoir characteristics, and to explore the effect of reservoir characteristics on evaluation parameters.The results show that the reservoirs in Sulige gas field are characterized by low porosity, low permeability and strong heterogeneity, thus the volumetric method is suitable for its resource evaluation.The reservoir thickness and area are controlled by the distribution and superimposition pattern of sand bodies, and the distributary channels and composite sand bodies with large thickness and area are usually high in resource potentials and more productive.The reservoir porosity and permeability are controlled by debris composition and microscopic pore type, and are strongly modified by diagenesis at later stages.Compaction and cementation lower porosity, whereas dissolution may effectively increase it.The intensity of hydrocarbon generation fundamentally controls the distribution of the water producing zone and gas producing zone, while the sweet spots of tight gas are mainly located in areas of relatively high porosity and permeability in favorable reservoirs.For resource evaluation of tight sand gas reservoirs, the sedimentation controls the distribution and superimposition patterns of sand bodies, produces composite sand bodies of various types, determines reservoir area and thickness, and then controls the gas storage potential and production capacity.Diagenesis modifies reservoir porosity and permeability, thus mainly influences oil and gas reserves of the study area in a microscopic sense.

Key words: diagenesis, sand body distribution, the 8th member of Shihezi Formation, the 1st member of Shanxi Formation, reservoir characteristics, resource evaluation, tight sandstone, Sulige gas field

CLC Number:

TE122.3

Jinbu Li, Ya Li, Ji Zhang, Tebo Yang, Aiping Fan, Renchao Yang, Mingming Cui. Resource evaluation method and influence factors of its parameters for tight sand gas reservoir in southwestern Sulige gas field[J]. Oil & Gas Geology, 2020, 41(4): 730-743, 762.

Figures/Tables 12

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层位	石英/%	长石/%	岩屑/%			胶结物/%				杂基/%
层位	石英/%	长石/%	沉积岩	变质岩	岩浆岩	硅质+钙质	高岭石	伊利石	绿泥石	杂基/%
盒8段	89.01	1.44	1.76	7.14	0.65	4.92	6.02	3.41	0.76	9.28
山1段	90.80	1.38	1.64	6.00	0.17	6.77	6.83	3.17	0.57	6.01

层位	样品数	非均质系数	变异系数	突进系数	综合评价	备注
盒8段	73	0.17	0.75	5.8	较强非均质性	弱非均质性：变异系数< 0.5，突进系数< 2；强非均质性：变异系数0.5~0.7，突进系数2~3；较强-严重非均质性：变异系数>0.7，突进系数>3
山1段	69	0.23	0.65	4.4	较强非均质性

沉积微相	盒8段			山1段
沉积微相	面积/km²	厚度/m	储量/(10⁸ m³)	面积/km²	厚度/m	储量/(10⁸ m³)
分流河道	478.58	4~7.5	371.09	158.27	3.7~6.8	132.25
河口坝-远砂坝	97.39	5~9.1	150.90	23.02	4.6~7.2	34.00
席状砂	322.63	1~3.2	151.38	233.98	0.8~2.7	88.69

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Resource evaluation method and influence factors of its parameters for tight sand gas reservoir in southwestern Sulige gas field

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