摘要
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。
[Objective]The 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.[Methods]In 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.[Results]The 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.②The 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.③The 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.[Conclusion]This research provides guidance for the subsequent prediction and exploration of reservoirs of the Maokou Formation.
作者
刘珍
刘鹏
王鹏
刘志刚
温银宇
LIU Zhen;LIU Peng;WANG Peng;LIU Zhigang;WEN Yinyu(BGP Inc.,China National Petroleum Corporation Southwest Geophysical Research Institute,Chengdu 610036,China)
出处
《地质科技通报》
北大核心
2025年第5期144-152,共9页
Bulletin of Geological Science and Technology
关键词
川南云锦向斜地区
茅口组岩溶微地貌
梯度结构张量属性
岩溶塌陷体
储层特征
Yunjin synclinal area in southern Sichuan
Maokou Formation karst microgeomorphology
gradient structure tensor attribute
karst collapse body
reservoir characteristic
