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琼东南盆地经过多年的勘探与研究，已发现丰富的油气资源，且在勘探上取得了较大突破。但由于该区地质条件极其复杂，海洋油气勘探程度很低，勘探成本高，石油地质研究水平也比较低。在崖13－1大气田发现后，对琼东南地区的油气资源潜力有了新的认识，分析认为区内有巨大的油气资源前景，但油气运移方向和路程均不清楚，勘探重点的选取问题一直得不到解决。地层流体受两大流体系统的控制——压实流和重力流，利用流体势分析系统研究地下流体势及压力分布可克服井资料不系统的局限性，有效地进行油气资源的预测评价。用地下流体力场和势分析的方法可以统一处理和定量解释油气的运移和聚集规律，明确预测油气运移的主通道，确定有利的油气勘探靶区，显著提高钻探成功率。综合研究剖面、平面流体势及压力特征，结合其他有关地质资料，找出最有利的勘探目的层位。该方法在琼东南盆地松东地区的应用，取得了良好的效果。

GAS POTENTIAL ANALYSIS OF SONGDONG REGION IN QIONGDONGNAN BASIN

Qiongdongnan Basin has been investigated for many years，abundant oil and gas resources have been found out，and a relatively large breakthrough has been made in oil and gas explorationBecause the geological conditions in this region are very complicated，the degree of offshore oil and gas exploration is very low with a high exploration cost and the level is relatively low in studying petroleum geologyA new knowledge of the hydrocarbon resources in Qiongdongnan Basin occurred after the Ya13 1 gas field’s being found out. Through analyzing, it was thought that there is a vast range of prospects for finding out the hydrocarbon resources in the basin，however，the path and direction of oil and gas migration are not distinct and the problem of selecting exploration key points is not solved yetThe fluids in formation are controlled by two fluid systems，iecompaction fluid and gravity fieldThe limitation of being short of the data drilled may be overcome and the prediction and evaluation of hydrocarbon resources can be effectively carried out by use of the fluid potential analysis method to study the distribution characteristics of the underground fluid potentials and pressuresBy applying the underground fluid pressure field and potential analysis methods，the rules of oil and gas migration and accumulation may be wholly treated and quantitatively interpreted，the main path of oil and gas migration can be certainly predicted and the beneficial target areas of oil and gas exploration may be determined, thus raising obviously the frilling success ratioOn the basis of synthesizing the characteristics of the seismic sections，fluid potentials and formation pressures in this region，the most favorable exploration target formation was found out in combination with the other geological data concernedA good result has been achieved by applying such a method to Songdong region in Qiongdongnan Basin.