丽水凹陷潜山裂缝发育特征及预测——以A洼为例

Characteristics and Prediction of Buried Hill Fractures in Lishui Sag--A Case Study in Sag A

东海盆地丽水凹陷基岩潜山成带发育,钻井已证实其含油气性,勘探潜力巨大。本文综合现有潜山岩心、成像测井及三维地震资料开展岩心裂缝综合分析及测井识别,利用叠后蚂蚁体属性和叠前裂缝强度对潜山不同尺度裂缝展开预测。研究表明,丽水凹陷潜山裂缝以中高角度构造裂缝为主,北东-南西走向,形成主要受区域构造活动控制;丽水A洼灵峰潜山裂缝发育程度高于仙桥潜山,研究区发育3个各尺度裂缝均较为发育的潜山勘探目标,是丽水凹陷下一步潜山领域勘探的有利方向。

The buried hills are well developed in Lishui Sag,East China Sea Shelf Basin.They have been proven to be petroleum bearing and have great exploration potential.In this paper,core fracture comprehensive analysis and logging identification are carried out based on the buried hill core data,imaging logging,and 3D seismic data.Post-stack ant-tracking property and pre-stack fracture strength are used to predict fractures in the buried hill on a different scale.The results show that the buried hill fractures in Lishui Sag are dominated by middle-high angle structural fractures,which strike from northeast to southwest,and are mainly controlled by regional tectonic activities.The fracture development degree of the Lingfeng buried hill in Lishui Sag A is higher than that of the Xianqiao buried hill.The study area has developed three buried-hill exploration targets with relatively well-developed fractures of all scales,which are favorable directions for the next buried hill exploration in the Lishui Sag.