摘要
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。
Abstract
In this paper, the authors made an early stage prediction about the probability of finding oil and gas in a terrestrial facies fault basin. The basis in chief is the seismic data. This prediction provided some objective foundation for the further exploration.1. the velues of the maturity TTI of oil and gas of the fault basin were calculated, the characteristics of the oil and gas genesis of various parts of the regional structure were evaluated and pointed out.2. The seismic and sedimental facies were analyzed and interpreted, the relic water systems were built up, the fossil sedimental environments were examined.3. The chart of all kinds of traps were compiled. The structures and lithostratigraphic traps were classified into six types.4. All these traps were appraised according to 7 indexes. The final results were as follows:type Ⅰ: 30-40 scores type Ⅱ: 22-29 scores type Ⅲ 18-21 scores type Ⅳ: less than 17 scores5. The oil and gas reservoir of the fault basin were calculted by the Monte-Carlo method and the probability curves of various kinds were worked out.
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