北部湾盆地涠西南凹陷流沙港组二段下亚段页岩油储层非均质性特征

doi:10.11743/ogg20230410

Abstract

Abstract:

Weixinan Sag， an important area for the exploration and development of both conventional and unconventional hydrocarbon in the Beibu Gulf Basin， South China Sea， has witnessed the success of well WY-1 which tested commercial oil and gas flow after fracturing in July， 2022， marking a major breakthrough in offshore shale oil development in China. An integration of the analysis of core， thin section， mineral composition， organic geochemistry， scanning electron microscope （SEM）， matrix porosity and permeability and fine logging， is applied to study the heterogeneous signatures of shale oil reservoirs in well WY-1， Weixinan Sag. The results are shown as follows. Four types of lithofacies can be identified in the lower submember of the second member of Liushagang Formation （E₂l^2（1）） in well WY-1， including highly siliceous clayey mudstone， mixed mudstone， clay-rich siliceous siltstone and （mixed） siliceous sandstone. Lithofacies is key to the reservoir heterogeneity. An analysis of the physical properties， pore throat characteristics， mobility and brittleness of the four types of lithofacies， indicates that the reservoir space is dominated by intergranular pores， and the （mixed） siliceous sandstone facies is of the highest porosity and permeability， the best compressibility and the highest mobility， a favorable lithofacies， followed by clay-rich siliceous siltstone， and the mixed mudstone and highly siliceous clayey mudstone coming at last though the compressibility and mobility of mixed mudstone are relatively better than the highly siliceous clayey mudstone. It is found that the favorable lithofacies for reservoir development can be sorted as （mixed） siliceous sandstone the first， followed by clay-rich siliceous siltstone， mixed mudstone and highly siliceous clayey mudstone in order. In terms of the vertical distribution of reservoir properties， the bottom interval of the E₂l^2（1） dominated by （mixed） siliceous sandstone interbedded with clay-rich siliceous siltstone， is the best in reservoir property， mobility and compressibility； the brittleness and compressibility of the interbedded mixed mudstone and highly siliceous clayey mudstone in the middle interval of the E₂l^2（1） are better than the upper interval. In all， it can be concluded that the sweet-spot section in well WY-1 is mainly composed of （mixed） siliceous sandstone interbedded with clay-rich siliceous siltstone in the lower interval of the E₂l^2（1）， followed by the middle interval where mixed mudstone is well developed.

Key words: lithofacies, heterogeneity, shale oil reservoir, E₂l^2（1）, Weixinan Sag, Beibu Gulf Basin

CLC Number:

TE122.2

Yong DENG, Caiwei FAN, Desheng HU, Weijun HE, Jianxin ZHANG. Heterogeneity of shale oil reservoirs in the E₂l^2（1） in Weixinan Sag， Beibu Gulf Basin[J]. Oil & Gas Geology, 2023, 44(4): 923-936.

Figures/Tables 12

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岩相类型	矿物组成	构造	粒径/μm	TOC/%	厚度占比/%
富硅黏土质泥岩相	黏土矿物：50 % ≤Φ< 80 % 碳酸盐矿物：Φ< 10 %	层状	<32.0	（3.78 ~ 8.14）/5.72	60.23
混合质泥岩相	黏土矿物：20 % ≤Φ< 50 % 碳酸盐矿物：20 % ≤Φ< 50 %	层状	<32.0	（0.86 ~ 9.54）/5.19	32.76
富黏土硅质粉砂岩相	碳酸盐矿物：Φ< 10 % 长英质矿物：50 ≤Φ< 80 %	层状	32.0 ~ 62.5	（0.49 ~ 3.79）/1.58	6.26
（混合）硅质砂岩相	碳酸盐矿物：Φ≥10 % 长英质矿物：Φ≥50 %（混合硅质砂岩相）或Φ≥80 %（硅质砂岩相）	块状	>62.5	（0.51 ~ 0.66）/0.56	0.75

岩相	孔隙度/%		渗透率/（10^-3μm²）
岩相	范围	平均值	范围	平均值
富硅黏土质泥岩相	2.6 ~ 16.2	6.5	0.12 ~ 1.58	0.40
混合质泥岩相	2.9 ~ 4.9	3.9	0.11 ~ 0.80	0.40
富黏土硅质粉砂岩相	4.7 ~ 11.9	8.5	0.01 ~ 1.73	0.26
（混合）硅质砂岩相	8.0 ~ 16.7	11.7	0.04 ~ 2.75	0.89

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Heterogeneity of shale oil reservoirs in the E₂l^2（1） in Weixinan Sag， Beibu Gulf Basin

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Heterogeneity of shale oil reservoirs in the E2l2（1） in Weixinan Sag， Beibu Gulf Basin

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Heterogeneity of shale oil reservoirs in the E₂l^2（1） in Weixinan Sag， Beibu Gulf Basin