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

摘要/Abstract

摘要：

如何利用常规测井资料对储层含油性、储集性及可压性进行有效评价，是苏北页岩油规模化开发亟需解决的生产难题。利用常规测井资料与岩心实验资料，采用最优化、拟合、正反演数值模拟等数学手段，建立起总有机碳含量、有效孔隙度、层理缝密度、矿物组分含量等参数的计算模型，对页岩沉积构造和岩相进行分类研究。研究表明：溱潼凹陷阜宁组二段（以下简称阜二段）泥页岩以富有机质层状或纹层状泥岩、富有机质块状泥岩为主，有利岩相为富有机质层状或纹层状泥岩，有利岩相纵向上与非有利岩相交互出现。采用文中所导出的模型识别的“甜点”层段与采用特殊测井分析的层段位置具有良好的一致性，且现场应用效果良好。该方法和技术已应用于苏北盆地页岩油储层地质工程“甜点”段的选定工作，对苏北页岩油效益开发具有重要意义。

关键词: 苏北盆地, 页岩油, 常规测井, 岩相, 地质工程“甜点”段

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”

中图分类号:

TE122

王欣,韩建强,昝灵,李小龙,彭兴平. 苏北盆地溱潼凹陷阜宁组二段页岩油测井评价研究[J]. 油气藏评价与开发, 2024, 14(3): 364-372.

WANG Xin,HAN Jianqiang,ZAN Ling,LI Xiaolong,PENG Xingping. 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.

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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