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中国石油东方地球物理公司西南物探研究院
Online First:07 June 2024,
Published:2025
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刘珍, 刘鹏, 王鹏, et al. 川南云锦地区茅口组岩溶微地貌识别及储层特征[J]. Bulletin of Geological Science and Technology, 2025, 44(5): 144-152.
刘珍, 刘鹏, 王鹏, et al. 川南云锦地区茅口组岩溶微地貌识别及储层特征[J]. Bulletin of Geological Science and Technology, 2025, 44(5): 144-152. DOI: 10.19509/j.cnki.dzkq.tb20230576.
川南地区下二叠统茅口组岩溶储层发育,是川南常规油气勘探关键层系。表生型岩溶储层发育程度直接受控于丰富多变的岩溶微地貌,所形成的岩溶储层横向非均质性强。利用三维地震资料,结合地层厚度、梯度结构张量属性和地质体雕刻技术刻画了云锦地区东吴期岩溶微地貌特征,并通过模型正演和振幅属性,预测了表生岩溶储层有利区带。研究结果表明:(1)云锦地区在东吴期岩溶微地貌差异大,发育一系列岩溶塌陷体,在地震上表现为茅口组顶界地震同相轴“下拉”的特征;(2)利用梯度结构张量属性结合地质体雕刻技术有效刻画了云锦向斜区岩溶塌陷体,分析了其展布规律,平面上呈孤立、线状或连片3种展布方式;(3)岩溶塌陷体边缘两侧地震振幅减弱区,岩溶作用强烈,溶蚀孔洞发育,为储层发育有利区带。研究成果对后续川南云锦地区茅口组储层预测工作具有指导意义。
ObjectiveThe development of karst reservoirs in the Maokou Formation of the Lower Permian in southern Sichuan Province is critical for conventional oil and gas exploration in this region. The development level of supergene karst reservoirs is directly controlled by the rich and diverse karst microgeomorphology
leading to strong lateral heterogeneity within these reservoirs. MethodsIn this study
3D seismic data
combined with strata thickness
gradient structure tensor attributes
and geological body carving techniques
were employed to characterize the microgeomorphic features of the Dongwu karst in the Yunjin area. Moreover
favourable zones for surface karst reservoirs were predicted through model forward modeling and amplitude attributes. ResultsThe results suggested that significant differences in karst microgeomorphology existed during the Dongwu period in the Yunjin area
where a series of karst caves developed. These caves exhibit a seismic feature of a "pull-down" in the seismic event axis at the top boundary of the Maokou Formation. ② The distribution pattern of karst collapse bodies in the Yunjin syncline area was effectively characterized using gradient structure tensor attributes combined with geological body carving technology. The karst collapse bodies exhibit three distinct distribution patterns: Isolated
linear
or contiguous distributions. ③ The seismic amplitude on both sides of the karst collapse bodies is weakened
indicating strong karstification and the development of karst caves
which are favorable zones for reservoir development. ConclusionThis research provides guidance for the subsequent prediction and exploration of reservoirs of the Maokou Formation.
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