千米桥潜山凝析气藏勘探开发难点与对策分析

THE EXPLORATION AND DEVELOPMENT DIFFICULTIES AND COUNTERMEASURE ANALYSIS FOR CONDENSATED GAS RESERVOIR OF QIANMIQIAO BURIED HILL

开采实践说明千米桥潜山凝析气藏存在严重的非均质性。从地质角度来看,落实潜山顶面精细构造形态、搞清奥陶系内幕构造成因和样式、描述和评价潜山碳酸盐岩储层、查明气藏类型和分布及其连通性问题是千米桥潜山凝析气藏当前勘探开发工作的主要难点。为此建议:①采用速度各向异性的选前深度成像开展地震解释方法攻关;②应用露头区构造模拟方法深入研究潜山内幕构造成因及形成时限;③采用新技术精细表征裂缝性储层;④建立准确的地质模型,搞好适合岩溶储层特点的地震储层预测;⑤强化多学科综合研究,准确判定气藏类型及分布特征。

The development effect of Qianmiqiao buried hill condensated gas reservoir shows that it is with serious heterogeneity. Thus the current difficult issues for exploration and development mainly lie in the aspects such as analyzing and detailedly defining the top surface structure of the buried hill from the geological view in order to get full and clear understanding of the structure genesis and style inside Ordovician, carrying out researches like the reservoir description and evaluation of buried hill carbonate rocks, the gas reservoir type, distribution as well as connectivity. In this paper the author puts forward the countermeasures as follows: carry out seismic explanation to solve the problems by adopting prestack depth imagining of velocity anisotropy, apply the structure simulation from outcrop areas to study the buried hill internal structure genesis and determine its forming time span, positively use new technology to thoroughly describe the fracturing reservoir; establish correct geological model to complete the seismic reservoir prediction agreed with the karst reservoirs; strengthen the comprehensive research integrated with multi-disciplines, and judge the gas reservoir type and distribution characteristics accurately.