AVO技术在二连盆地吉尔嘎朗图凹陷低煤阶煤层气预测中的应用  

Application of AVO technique in the prediction of low-rank CBM in Jiergalangtu Sag of Erlian Basin

作　　者：张鹏豹 李凡异 杨童 韩峰 高歌 张晨 ZHANG Pengbao;LI Fanyi;YANG Tong;HAN Feng;GAO Ge;ZHANG Chen(Exploration and Development Research institute of Huabei Oilfield Company,Renqiu 062552,China;CNOOC Research Institute Co Ltd,Beijing 100028,China;Beijing Ultrado Resources Technology Inc,Beijing 100089,China)

机构地区：[1]中国石油华北油田分公司勘探开发研究院,河北任丘062552 [2]中国海油研究总院有限责任公司,北京100028 [3]北京奥能恒业能源技术有限公司,北京100089

出　　处：《大庆石油地质与开发》2021年第1期129-136,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“华北地区中低煤阶煤层气规模开发区块优选评价”(2016ZX05041-003)。

摘　　要：吉尔嘎朗图凹陷白垩系的赛汉塔拉组煤层为含气量较低的低煤阶褐煤,寻找含气量相对高的“甜点区”是该地区优化钻井部署所面临的难点。针对该区沉积环境复杂、煤层厚度横向变化大等特点,动态正演模拟分析了煤层的含气性、厚度以及顶板岩性对煤层AVO的影响,总结AVO的响应特征和AVO属性的变化规律,判定AVO烃类检测的可行性和适用条件。结果表明,P+G属性烃类检测效果与实际钻井含气量和累计产气量的吻合率达到75%以上,利用该属性并结合区域地质认识,指出了有利的勘探方向。Cretaceous Saihantala-Formation coal seam in Jiergalangtu Sag is low-rank lignite with rather lower gas content and it is difficult to find sweet spot with relatively high gas content for optimizing the drilling deployment in this area.In view of the characteristics of the complex sedimentary environment and large lateral variation of the coal seam thickness in this area,the influences of the gas content,thickness and roof lithology on the AVO in the coal seam were analyzed by dynamic forward modeling.The response characteristics and the variation of the AVO attribute were summarized.The feasibility and applicable conditions of the AVO hydrocarbon detection were determined.The results show that the coincidence rate of the hydrocarbon detection effects of P+G attributes with the actual drilling gas content and cumulative gas production is more than 75%.Using this attribute and combining with the regional geological knowledge,the favorable exploration direction is pointed out.

关 键 词：吉尔嘎朗图凹陷 低煤阶 煤层气 AVO 动态正演模拟 烃类检测 

分 类 号：P631[天文地球—地质矿产勘探]