苏北盆地溱潼凹陷阜宁组二段页岩油测井评价研究

doi:10.13809/j.cnki.cn32-1825/te.2024.03.006

Abstract

Abstract:

The efficient evaluation of the oil properties, capabilities, and compressibility of reservoirs using conventional logging data is essential for the large-scale development of shale oil in northern Jiangsu. Utilizing conventional logging data alongside core experiment data, this study develops a robust model to calculate several critical reservoir characteristics. These include total organic carbon content, effective porosity, bedding fracture density, and mineral composition content. The model employs a variety of mathematical methodologies such as physical concept analysis, optimization, fitting, and both forward and backward numerical simulations. Furthermore, this research classifies the sedimentary structure and lithofacies of the reservoir. Results indicate that the shale within the second member of Funing Formation in Qintong Sag predominantly consists of organic-rich layered/laminated mudstone and block mudstone. Among these, the layered or laminated mudstone represents the favorable lithofacies, intersecting vertically with non-favorable rock types. The “sweet spot” layers identified by the model correlate well with the layers analyzed using specialized logging techniques, and field applications have yielded positive outcomes. This technology has been successfully applied in identifying geological and engineering “sweet spots” within the shale oil reservoirs of the Subei Basin, offering significant guidance for the strategic development of shale oil in the region.

Key words: Subei Basin, shale oil, conventional logging, lithofacies, geological & engineering “sweet spots”

CLC Number:

TE122

Xin WANG,Jianqiang HAN,Ling ZAN, et al. Logging evaluation of shale oil in the second member of Funing Formation of Qintong Sag, Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(3): 364-372.

Figures/Tables 10

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矿物组分	含量计算公式
石英	Q_ua=-0.085G_GR-0.197R_RT-0.138A_AC+4.623D_DEN+0.303C_CNL+79.715
长石	F_el=0.151G_GR-0.094R_RT-0.112A_AC-9.377D_DEN-0.198C_CNL+56.555
方解石	C_al=-0.427G_GR-0.177R_RT+0.157A_AC+66.105D_DEN-0.225C_CNL-150.178
白云石	D_ol=0.162G_GR+0.833R_RT-0.045A_AC-4.66D_DEN+0.882C_CNL-6.373
黄铁矿	P_yr=0.009G_GR-0.039R_RT+0.025A_AC-4.677D_DEN-0.126C_CNL+9.621
黏土	C_la=0.191G_GR-0.326R_RT+0.114A_AC-42.77D_DEN-0.636C_CNL+110.66

岩相类型	总有机碳含量/%	沉积构造类型	岩性类型
富有机质层状或纹层状泥岩	≥0.7	层状或纹层状	泥岩
富有机质层状或纹层状含灰质泥岩	≥0.7	层状或纹层状	含灰质泥岩
富有机质块状泥岩	≥0.7	块状	泥岩
富有机质块状含灰质泥岩	≥0.7	块状	含灰质泥岩
层状或纹层状泥岩	<0.7	层状或纹层状	泥岩
层状或纹层状含灰质泥岩	<0.7	层状或纹层状	含灰质泥岩

储层类型	电性			含油性		储集性	可压性		岩相
储层类型	自然伽马/ API	深感应电阻率/ （Ω·m）	测井声波时差/ （μs/m）	总有机碳含量/ %	原始含油饱和度/ %	孔隙度/ %	层理缝密度/ （条/m）	脆性/ %	岩相
Ⅰ类层	≥95	≥20	≥215	≥0.7	≥45	≥3	≥500	≥60	富有机质层状或纹层状（含灰质）泥岩
Ⅱ类层	≥75	≥15	≥205	≥0.7	≥20	≥2	≥0	≥50	富有机质块状（含灰质）泥岩
Ⅲ类层	≥45	≥5	≥195	≥0	≥0	≥1	≥500	≥45	层状或纹层状（含灰质）泥岩

Logging evaluation of shale oil in the second member of Funing Formation of Qintong Sag, Subei Basin

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