Shale Reservoir Characteristics of Cretaceous Madongshan Formation of Well Guye 1 in Liupanshan Basin

doi:10.19657/j.geoscience.1000-8527.2019.03.18

Abstract

Abstract:

Shale samples from the Cretaceous Madongshan Formation (Fm.) (Well Guye 1) in the Liupanshan Basin were used for reservoir characterization via core logging, thin section petrography, X-ray diffraction (XRD), scanning electron microscope (SEM) imaging and isothermal adsorption. The results show a variety of lithologic facies, such as shale, argillaceous carbonates, dolomite, carbonate-/dolomite-bearing or calcareous/dolomitic mudstone. In particular, the carbonate-/dolomite-bearing mudstone have higher TOC contents than the other rock types. The shale reservoir, with characterizing low porosity and low permeability of the Madongshan Fm., have a low clay content and relatively high feldspar and carbonate mineral contents. Optical microscopic and SEM petrographic observations reveal four kinds of microfractures (i.e.stratiform, stockwork, dissolution and intergranular fractures) and three kinds of pores (i.e.intergranular, dissolved and intergranular pores). The dissolved pores are filled by carbonaceous material, calcite, dolomite, plagioclase, illite and gypsum. The pore and fracture sizes vary mainly from 2 to 10 μm, and locally from 10 to 33 μm. Isothermal adsorption shows that CH₄ adsorption capacity of the Madongshan Fm. shale is between 0.96 and 4.6 m ³/t (average 2.29 m³/t). The Langmuir pressure is between 1.27 and 2.21 MPa (average 1.74 MPa). It is suggested that the Madongshan Fm. shale has a strong gas storage capacity but is difficult to be desorbed. To summarize, the Madongshan Fm. shale is a potential good oil and gas reservoir, characterizing by its abundance of pores and fractures, low poisson ratio, high brittleness, relatively good gas storage ability and readiness in development.

Key words: Liupanshan Basin, Well Guye 1, shale, reservoir, Madongshan Formation

CLC Number:

TE122

MA Fenghua, PAN Jinli, ZHANG Yong, MA Xiaojuan. Shale Reservoir Characteristics of Cretaceous Madongshan Formation of Well Guye 1 in Liupanshan Basin[J]. Geoscience, 2019, 33(03): 662-671.

Figures/Tables 11

Fig.1 Location of the study area and the oil and gas in Well Guye 1

Fig.2 Macrosopic and microscopic features of the Madongshan Fm. shale samples in Well Guye 1

Fig.3 Relationship between shale TOC content and lithologic facies of the Madongshan Fm. in Well Guye 1

Table 1 Whole-rock analysis results of the Madongshan Fm. shale in Well Guye 1(%)

黏土矿物	石英	钾长石	斜长石	方解石	白云石	黄铁矿	硬石膏	菱铁矿	方沸石
$2 ~ 20 13.2 *$	$7 ~ 48 17.2$	$0 ~ 17 4.9$	$6 ~ 39 19.4$	$0 ~ 35 12.4$	$0 ~ 61 25.5$	$1 ~ 8 3.8$	$1 ~ 23 3.4$	$1 ~ 2 1.2$	$1 ~ 10 4.2$

Table 1 Whole-rock analysis results of the Madongshan Fm. shale in Well Guye 1(%)

黏土矿物	石英	钾长石	斜长石	方解石	白云石	黄铁矿	硬石膏	菱铁矿	方沸石
$2 ~ 20 13.2 *$	$7 ~ 48 17.2$	$0 ~ 17 4.9$	$6 ~ 39 19.4$	$0 ~ 35 12.4$	$0 ~ 61 25.5$	$1 ~ 8 3.8$	$1 ~ 23 3.4$	$1 ~ 2 1.2$	$1 ~ 10 4.2$

Fig.4 Ternary diagram of mineral content of the Madongshan Fm. shale in Well Guye 1

Table 2 Reservoir parameters of the Madongshan Fm.shale in Well Guye 1

岩石密度/ (g/cm³)	比表面积/ (m²/g)	有效孔隙度/ %	渗透率/ 10^-3 μm²	比孔体积/ (ml/g)	孔径/ nm	弹性模量/ 10³ MPa	泊松比
$2.57 ~ 2 . 71 * 2.63 (30)$	$2.16 ~ 24.73 8.94 (50)$	$0.117 ~ 1.268 0.537 (50)$	$0.0009 ~ 0.0042 0.0021 (50)$	$0.0051 ~ 0.0218 0.01 (50)$	$3.54 ~ 7.28 5.52 (50)$	$20.19 ~ 52.47 30.21 (15)$	$0.13 ~ 0.29 0.23 (15)$

Table 2 Reservoir parameters of the Madongshan Fm.shale in Well Guye 1

岩石密度/ (g/cm³)	比表面积/ (m²/g)	有效孔隙度/ %	渗透率/ 10^-3 μm²	比孔体积/ (ml/g)	孔径/ nm	弹性模量/ 10³ MPa	泊松比
$2.57 ~ 2 . 71 * 2.63 (30)$	$2.16 ~ 24.73 8.94 (50)$	$0.117 ~ 1.268 0.537 (50)$	$0.0009 ~ 0.0042 0.0021 (50)$	$0.0051 ~ 0.0218 0.01 (50)$	$3.54 ~ 7.28 5.52 (50)$	$20.19 ~ 52.47 30.21 (15)$	$0.13 ~ 0.29 0.23 (15)$

Fig.5 Microfracture characteristics of the Madongshan Fm.shale in Well Guye 1

Fig.6 Pore characteristics of the Madongshan Fm.shale in Well Guye 1

Table 3 Isothermal adsorption results of the Madongshan Fm.shale in Well Guye 1

样品号	深度/m	湿度/%	实验温度/℃	V_L/(m³·t^-1)	P_L/MPa	R_o/%	最大甲烷吸附量/(m³/t)
H92	892.96~893.09	1.05	30	1.87	1.45	0.67	1.63
H93	897.36~897.48	0.78	30	1.72	2.21	0.61	1.42
H97	916.91~917.05	1.02	30	2.30	1.57	0.85	1.98
H100	928.79~928.97	1.04	30	3.78	1.81	1.12	3.17
Y12	957.76~957.86	0.95	30	1.07	1.27	0.76	0.96
H107	968.37~968.58	1.14	30	5.48	2.10	0.82	4.60

Fig.7 Isothermal adsorption curves of the Madongshan Fm. shale in Well Guye 1

Fig.8 Relations of Langmuir volume and pressure with Ro and depth of the Madongshan Fm. shale in Well Guye 1

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