塔里木盆地西南巴探井区石炭系非常规气藏圈闭的预测基于地震波衰减的含气检测方法  

Prediction of unconventional gas reservoir traps in the Carboniferous,Batan wells area,southwest of the Tarim Basin:Gas bearing detection method based on seismic wave attenuation

作　　者：陈庆龙 姜楠 王凯[4] 于梦涵 许政 赵鑫[5] CHEN Qinglong;JIANG Nan;WANG Kai;YU Menghan;XU Zheng;ZHAO Xin(Department of Geology,Northwest University,Xi'an 710069,China;State Key Laboratory of Continental Drnamics,Northwest University,Xi'an 710069,China;China Petroleum Materials Co.,Ltd.Xi'an Branch,Xi'an 71ooo0,China;Light Hydrocarbon Sales Department,Integrated Utilization Project Department of Associated Gas,PetroChina Changqing Oilfield Company,Xi'an 710016,China;Fourth Gas Production Plant,PetroChina Changqing Oil field Company,Inner Mongolia Erdos 017399,China;Xi'an Chuanqin Petroleum Technology Co.,Ltd.,Xi'an 710018,China)

机构地区：[1]西北大学地质学系,西安710069 [2]西北大学大陆动力学国家重点实验室,西安710069 [3]中国石油物资有限公司西安分公司,西安710000 [4]中国石油天然气股份有限公司长庆油田分公司伴生气综合利用项目部轻烃销售部,西安710016 [5]中国石油天然气股份有限公司长庆油田分公司第四采气厂,内蒙古鄂尔多斯017399 [6]西安川秦石油科技有限公司,西安710018

出　　处：《非常规油气》2023年第6期35-43,共9页Unconventional Oil & Gas

基　　金：国家自然科学基金项目“非常规油气开发地球物理理论与方法研究——中国非常规油气储层特征、分类与典型地质模型建立”(41390451)。

摘　　要：塔里木盆地西南巴探井区目前在奥陶系鹰山组发现了灰岩气藏,以地层及岩性气藏为主的非常规气藏具有良好的勘探前景。为了寻找其他有利圈闭,对巴探井区开展了基于三维地震数据分频能量衰减的含气检测。利用该方法将地震数据体分解,结合相关运算反映含气区域。将三维地震数据体分解为5Hz,10Hz,15Hz,20Hz,25Hz和30Hz的分频数据体,在已知含气区与非含气区主频基础上,通过比较2个单频数据体的能量差值来确定衰减异常区域。结果表明:1)卡拉沙依组底部地震剖面存在叠瓦状前积反射,反映三角洲前缘砂体沉积。2)以该类型砂体为储集单元,发育东西走向的非常规气藏圈闭。2个圈闭被海米罗斯断裂间隔,圈闭面积分别为31.45km^(2)和48.82km^(2),闭合度分别为160ms和220mS。3)该气藏圈闭范围与奥陶系鹰山组气藏一致,说明即使是岩性控制的非常规气藏,断裂仍是主体控制因素。In the Batan wells area,southwest of the Tarim Basin,a tuff gas reservoir has been discovered in the Ordo-vician Yingshan Formation,the unconventional gas reservoirs,mainly stratigraphic and lithologic,have good explo-ration prospects.In order to find other favorable traps,gas-bearing detection based on 3D seismic data with frequen-cy division energy attenuation is carried out in the Batan wells area.This method is applied to decompose the seismic data and combine them with relevant operations to depict the gas-bearing regions.Decompose the 3D seismic data body into 5 Hz,10 Hz,15 Hz,20 Hz,25 Hz and 30 Hz sub-frequency data bodies.Based on the known primary fre-quencies of the gas-bearing and non-gas-bearing regions,compare the energy differences between the two single-fre-quency data bodies to determine the attenuation anomaly region.The results indicate that:1)Imbricate progradation reflections exist in the Kalashayi Formation bottom seismic profile,reflecting the sedimentation of delta font sand bodies.2)Using this type of sand body as the reservoir unit to develop the east-west trending unconventional gas res-ervoir trap.The two traps are separated by the Hemiros fault,with trap areas of 31.45 km^(2) and 48.82 km^(2),and clo-sures degrees of 160 ms and 220 ms,respectively.3)The trap extent of this gas reservoir corresponds with the gas reservoir in the Ordovician Yingshan Formation,indicating that even in lithologically controlled unconventional gas reservoirs,fractures remain the primary controlling factor.

关 键 词：非常规气藏 含气检测 巴探井区 卡拉沙依组 三角洲前缘 

分 类 号：P631.4[天文地球—地质矿产勘探]