均方根振幅在乌伦古坳陷东部地区储层预测中的应用

乌伦古坳陷东部地域开阔,地表起伏较大,经历了多期构造活动改造,形成了北西-南东向构造格局。结合乌伦古坳陷东部的构造格局和沉积环境发育特点,采用均方根振幅属性对其进行有利储层预测。通过对该地区二维地震资料层序地层均方根振幅的研究,表明不同沉积时期、不同构造部位均方根振幅的平面分布随构造格局和沉积环境的变化而变化。红岩断阶带和乌伦古凹陷南缘深大断裂上盘为断背斜或断鼻构造圈闭。红岩断阶带下盘为岩性上倾带,以河流、(扇)三角洲沉积为主,岩性组合以砂泥互层为主,含砂率高,均方根振幅表现为高值,为油气聚集的有利目标区带。索索泉凹陷处于挤压隆升背景下的沉降部分,以湖相沉积为主,均方根振幅表现为低值,不利于形成有利储层。

Application of RMS Amplitude in Reservoir Prediction in the East of Wulungu Depression

RMS Amplitude is used to predict favorable reservoir belts based on the structural framework and the sedimental environment in the east of Wulungu depression. The research on RMS Amplitude of 2D seismic sequence stratigraphy in the area demonstrates the plane distribution of RMS amplitude changes with the structural belt or the sedimental environment: faulted anticline trap and faulted nose trap were developed in the hangingwall of Hongyan fracture zone and southern Suosuoquan sag and updip lithologic trap was developed in the footwall of Hongyan fracture zone. Both belts were dominated by fluvial, deltaic or fan deltaic deposition whose lithology was interbed sand-shale series and sandy highly, and RMS amplitude is high in the belts. So the two belts may become favorable structural belts for prospecting. However, Suosuoquan sag was the tectonic subsidence belt and was dominated by lacustrine facies. RMS amplitude is low in the belt. For the above reasons, Suosuoquan sag is unfavorable to be good reservoir belt.