鄂尔多斯盆地马家滩地区乌拉力克组页岩气藏甜点预测

doi:10.7657/XJPG20250303

摘要/Abstract

摘要：

鄂尔多斯盆地马家滩地区海相页岩气勘探区主力层系为中奥陶统乌拉力克组，储集层以硅质页岩为主，储集层薄，平面非均质性强，地震识别难度大。利用马家滩地区地质、测井、岩心等资料，开展了海相页岩储集层的岩石物理分析，提出了横波预测方法，优选出了表征海相页岩气藏甜点的岩石物理参数。结合钻井试气结果，建立了海相页岩气藏地质甜点和工程甜点的评价标准，并将叠后地震波形指示模拟和自组织神经网络融合技术结合，预测了页岩气藏甜点分布。结果表明，页岩气藏地质甜点和工程甜点主要在研究区西部和中部呈条带状分布。钻井结果证实，该页岩气藏甜点地震预测方法具有较高的应用和推广价值。

关键词: 鄂尔多斯盆地, 马家滩地区, 乌拉力克组, 海相页岩气藏, 横波预测, 地震预测

Abstract:

The Middle Ordovician Wulalike formation is the primary target for marine shale gas exploration in the Majiatan area of the Ordos Basin. The reservoir is dominated by siliceous shale and characterized by thin layers and strong horizontal heterogeneity, seriously challenging the seismic identification. By utilizing geological, logging, and core data from the Majiatan area, a petrophysical analysis was performed on the marine shale reservoir, a shear-wave prediction method was proposed, and the optimal petrophysical parameters for characterizing the sweet spots of the marine shale gas reservoir were identified. By integrating drilling and gas testing results, the evaluation criteria for geological and engineering sweet spots of the marine shale gas reservoir were established. By combining post-stack seismic waveform-indicated simulation with self-organizing neural network fusion techniques, the distribution of sweet spots in the shale gas reservoirs was predicted. The results show that the geological and engineering sweet spots are primarily distributed in a band-like pattern in the western and central parts of the study area. The drilling results confirm that the seismic prediction method for sweet spots of shale gas reservoirs is worthy of promotion.

Key words: Ordos Basin, Majiatan area, Wulalike formation, marine shale gas reservoir, shear-wave prediction, seismic prediction

中图分类号:

TE122.1

赵玉华, 王雅婷, 黄研, 赵德勇, 曹永亮. 鄂尔多斯盆地马家滩地区乌拉力克组页岩气藏甜点预测[J]. 新疆石油地质, 2025, 46(3): 273-279.

ZHAO Yuhua, WANG Yating, HUANG Yan, ZHAO Deyong, CAO Yongliang. Sweet Spot Prediction of Shale Gas Reservoirs in Wulalike Formation, Majiatan Area, Ordos Basin[J]. Xinjiang Petroleum Geology, 2025, 46(3): 273-279.

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甜点分类	地质甜点评价参数					工程甜点评价参数				试气产量/（10⁴ m³·d^-1）
甜点分类	地层厚度/m	深度/m	纵波阻抗/ （m·s^-1·g·cm^-3）	孔隙度/ %	总有机碳含量/%	剪切模量/GPa	杨氏模量/GPa	横波阻抗/ （m·s^-1·g·cm^-3）	脆性指数	试气产量/（10⁴ m³·d^-1）
Ⅰ类	45~80	4 200~4 600	11 200~13 200	>2.5	0.25~1.80	17~19	41~50	6 600~7 300	0.45~0.76	>4
Ⅱ类	30~60	4 250~4 500	11 800~14 200	1.5~2.5	0.25~1.80	18~21	45~58	6 700~7 500	0.45~0.80	1~4
Ⅲ类	0~35	4 100~4 300	10 600~12 600	<1.5	<0.40	16~19	40~49	6 600~7 200	0.35~0.74	<1

井名	乌拉力克组顶面海拔/m	地层厚度/ m	有效储集层厚度/m	试气结果/ （10⁴m³·d^-1）	地震甜点预测结果
井名	乌拉力克组顶面海拔/m	地层厚度/ m	有效储集层厚度/m	试气结果/ （10⁴m³·d^-1）	地质甜点	工程甜点
J32井	-2 992.95	56.2	24.9		Ⅰ类	Ⅰ类
J22井	-2 736.08	85.3	40.0		Ⅰ类	Ⅱ类
J10井	-2 640.73	36.0	0		Ⅰ类	Ⅱ类
J23井	-2 566.66	12.0	0		Ⅲ类	Ⅲ类
J21井	-2 639.51	57.8	18.2		Ⅱ类	Ⅱ类
J9井	-2 590.56	46.6	0		Ⅰ类	Ⅱ类
J20井	-2 688.12	48.0	32.6	<1.0	Ⅰ类	Ⅰ类
J18井	-2 747.18	47.0	11.8		Ⅰ类	Ⅰ类
J11井	-2 594.56	43.2	0		Ⅰ类	Ⅱ类
J6井	-2 586.93	28.2	12.5		Ⅰ类	Ⅰ类
J25井	-2 560.98	44.3	0		Ⅱ类	Ⅲ类
J24井	-2 554.82	25.2	8.2		Ⅱ类	Ⅲ类
J19井	-2 798.18	54.7	29.2	<1.0	Ⅱ类	Ⅲ类
J17井	-2 824.61	77.5	11.6		Ⅱ类	Ⅲ类
J12井	-2 737.32	56.0	0		Ⅱ类	Ⅱ类
J4井	-2 612.64	38.0	20.3		Ⅲ类	Ⅲ类
J13井	-2 820.93	61.4	0.9	<1.0	Ⅰ类	Ⅰ类
J16井	-2 873.11	37.0	29.3	>4.0	Ⅰ类	Ⅰ类
J3井	-2 672.49	45.0	0		Ⅱ类	Ⅲ类
J26井	-2 603.00	33.0	1.3	<0.1	Ⅲ类	Ⅲ类
J14井	-2 860.35	59.1	15.5	<1.0	Ⅰ类	Ⅱ类
J15井	-2 956.04	49.0	45.4	>10.0	Ⅰ类	Ⅰ类
J5井	-2 768.09	21.0	0		Ⅱ类	Ⅲ类
J7井	-2 847.28	36.0	11.9		Ⅲ类	Ⅲ类
J8井	-2 828.65	11.8	0		Ⅰ类	Ⅲ类