勘探阶段岩性气藏描述与预测技术思路及技术体系

THOUGHT AND SYSTEM OF LITHOLOGIC GAS RESERVOIR DESCRIPTION AND PREDICTION TECHNIQUES IN EXPLORATION PHASE

中国陆相盆地特有的构造、沉积及物源条件决定了岩性油气藏为中国陆相盆地中广泛而普遍存在的地质现象。随着中国陆相盆地油气勘探开发程度的提高，岩性油气藏所占比例越来越大，重要性日趋突出。同时，岩性油气藏具有高度复杂性和难以预测性，如何充分利用地震、地质、测井、钻井、测试及分析化验资料，极大地发挥三维地震资料的空间预测能力，形成岩性油气藏描述与预测技术思路及技术体系，提高对岩性油气藏的综合描述与预测能力，是目前岩性油气藏勘探突破技术之关键。文章以准噶尔盆地夏盐３井区岩性气藏描述与预测为具体研究实例，形成了以精细构造分析技术、相（微相）分析技术、层序地层分析技术、储层综合分析与评价技术、地震储层横向预测技术、多参数合油气检测技术、地震多元属性分析技术及综合分析与评价技术等手段为支撑的岩性气藏描述与预测技术体系。实际应用表明，该套技术体系对于勘探阶段岩性油气藏的描述与预测是行之有效的。

In China, lithologic reservoir is a common geological feature in continental sedimentary basins, being controlled by special structural, depositional and source areal conditions; and along with raising the degree of oil and gas exploration and development in the continental sedimentary basins, the ratio occupied by the lithologic reservoirs is greater and greater and they become more and more important. Because the lithologic reservoirs are very complicated and predicted hardly, it is the key of forming a technical breakthrough in the lithologic reservoir exploration at present to raise the capacity of comprehensively describing and predicting the lithologic reservoirs, through fully utilizing all the data on seismic exploration, geology, well logging, drilling, testing, analyzing and chemical examination, etc., and greatly giving rein to the spacial predicting function of 3 - D seismic data to form the thought and system of lithologic reservoir description and predication techniques. By taking the description and predication of the lithologic gas reservoir at the area of well Xiayan - 3 in Zhunge' er Basin as an example, the lithologic gas reservoir description and prediction technical system was formed on the basis of these techniques, such as fine structural analysis, facies (microfacies) analysis, sequence stratigraphical analysis, reservoir comprehensive analysis and evaluation, seismic reservoir lateral prediction, multiparameter hydrocarbon detection, seismic multivariate attribute analysis and comprehensive analysis and evaluation, etc. Through application in practice it is shown that such a technical system is effective on the lithologic reservoir description and prediction in exploration phase.