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迈陈凹陷东部地区钻井资料少,地震资料差,扇体识别难度大。在地震沉积学解释思路的指导下,以三维地震资料为基础,结合井资料,建立地层格架,将涠洲组地层划分7个三级层序。利用地震属性横向分辨率高和地震波阻抗剖面垂向分辨率高的特点,开展精细的扇体识别研究。利用地震沉积学的方法识别扇体,克服了传统扇体识别以地震相刻画为主,没有明确的地质含义的的局限。通过应用,迈陈凹陷东部地区灯楼角断层下降盘发育多个“朵叶状”扇体,纵向上相互叠置。
The eastern part of the Maichang Sag has less drilling data, poor seismic data and difficult fan identification. Under the guidance of the interpretation of earthquake sedimentology, based on the 3D seismic data and well data, the stratigraphic framework is established, and the strata of Weizhou Formation are divided into seven third-order sequences. By using the characteristics of high lateral resolution of seismic attributes and high vertical resolution of seismic impedance profile, a detailed study of fan sector identification is carried out. The method of seismic sedimentology is used to identify the fan body, which overcomes the limitation that the traditional fan body recognition is mainly seismographic facies and has no definite geological meaning. Through the application, a number of “fan-leaf-like” fan bodies are developed on the descending plate of the corner of the lamp house in the eastern part of the Mai-Mai Sag, superimposed longitudinally on each other.