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本文利用地震资料对一个陆相沉积断陷盆地的油气进行早期预测,为进一步勘探提供客观的依据。1.应用地震资料计算断陷盆地的油气成熟度(TTI)值,圈定生油岩成熟度的范围,指出不同区域构造部位的成油特征。2.进行地震相和沉积相的分析解释,建立古水流体系,研究古沉积环境。3.编制各种类型圈闭图件,划分出六种不同类型的构造、地层岩性局部圈闭。4.对各类局部圈闭按七项指标进行评价:总分在30—40分的划为Ⅰ类圈闭;22—29分的为Ⅱ类圈闭;18—21分的为Ⅲ类圈闭;17分以下皆归Ⅳ类圈闭。5.利用蒙特卡洛方法计算断陷盆地的油气储量,作出各种类型的概率曲线。石油普查勘探作为一个独立阶段而存在,在此阶段中早期油气预测显得十分重要。应用地震地层学的原理和方法是解决这一问题的有效途径。通过这项工作,可指出有利部位、有利层位和重点勘探对象,对加速油气勘探和指导勘探部署以及提高钻探命中率都具有明显的现实意义和经济效益。
In this paper, the early prediction of oil and gas in a continental sedimentary faulted basin using seismic data provides an objective basis for further exploration. 1. Applying seismic data to calculate hydrocarbon maturity (TTI) value in fault-depression basin, delineating the range of maturity of source rock and pointing out the oil-forming characteristics of tectonic parts in different regions. 2. Analysis and interpretation of seismic facies and sedimentary facies, the establishment of paleocurrent system, the study of ancient sedimentary environment. 3. Preparation of various types of traps map, divided into six different types of structures, local lithology trap. 4. Evaluate all kinds of local traps according to seven indicators: class Ⅰ traps with a total score of 30-40 points; class Ⅱ traps with 22-29 points; class Ⅲ tracts with 18-21 points Closed; 17 points are classified as Category IV trap. 5. Use Monte Carlo method to calculate oil and gas reserves in fault-depression basin and make various types of probability curves. Petroleum census exploration exists as an independent stage, early oil and gas prediction in this stage is very important. The application of the principles and methods of seismic stratigraphy is an effective way to solve this problem. Through this work, it can be pointed out that favorable sites, favorable horizons and key exploration targets have obvious practical significance and economic benefits in accelerating the exploration and guidance of exploration and deployment and in increasing the drilling hit rate.