冷东地区下干柴沟组上段沉积储层特征研究

Abstract

Abstract:

Based on the data of the heavy mineral, core, logging and physical, we studied the sedimentary microfacie reservoirs' characteristics of the upper reservoir of the lower Gangchaigou formation in eastern Lenghu region. The results show that during the deposition period, the area is close to the source, and the developed raided river delta plain, sandstone type is mainly composed of feldspar lithic sandstone and lithic feldspar sandstone, and its composition and structure maturity are low. The main pore types of the reservoir are the residual intergranular pores, and the grain size is positively correlated with the porosity and permeability. According to the reservoir classification standard, the reservoir area is divided into three types, most of which not only belong to reservoir Ⅱ and Ⅲ with low porosity and permeability, but also belong to medium and low porosity-low permeability reservoirs with strong heterogeneity. The physical properties of reservoirs in the study area are related to the hydrodynamic forces at the time of the sedimentation. The high quality reservoirs are mainly distributed in thick sand bodies with braided river delta distributions.

Key words: upper reservoin of the lower Gangchaigou formation, sedimentary facies and reservoir characteristic, physical characteristics, reservoir evaluation

CLC Number:

TE122.2

Bo Chen,Yuanyuan Hao,Haixing Shi, et al. Sedimentary facies and reservoir characteristics of upper reservoir of lower Gangchaigou formation in eastern Lenghu region[J]. Reservoir Evaluation and Development, 2018, 8(3): 1-6.

Figures/Tables 9

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References 17

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岩性	排驱压力/MPa	饱和度中值压力/MPa	饱和度中值半径/μm	最大连通孔喉半径/μm	最大进汞饱和度,%	退汞效率,%	孔隙度,%	渗透率/ 10^-3μm²
泥质粉砂岩	7.89	25.56	0.04	0.09	96.37	33.78	7.98	0.03
粉砂岩	3.39	8.96	0.09	0.26	92.56	23.89	13.26	0.16
细砂岩	0.38	2.78	0.28	2.12	81.98	13.97	18.76	2.46
中砂以上	0.26	2.69	0.31	3.46	72.96	13.89	18.96	8.66

储层类型	压汞参数
储层类型	孔隙度,%	渗透率/10^-3μm²	排驱压力/MPa	最大连通孔喉半径/μm	饱和度中值半径/μm
Ⅰ类	>20	>5	<1.09	>0.67	>0.16
Ⅱ类	8~20	0.1~5	1.09~4.06	0.67~0.18	0.16~0.05
Ⅲ类	<8	<0.1	>4.06	<0.18	<0.05

Sedimentary facies and reservoir characteristics of upper reservoir of lower Gangchaigou formation in eastern Lenghu region

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