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河套地区呼和坳陷生物气勘探已经成为长庆油田寻找后备储量的新领域。目前,该区生物气勘探研究程度低。本文主要利用地震反射波的振幅、连续性、内部结构和外部形态等地震反射特征,在第四系更新统的地震反射中识别出了3种地震相类型:中—强振幅连续反射平行—亚平行席状地震相、变振幅断续及较连续反射平行—亚平行席状地震相以及杂乱地震相。编制了研究区地震相平面分布图,同时利用单井资料对和1、和5井进行了单井沉积相分析。经综合分析,将地震相转变为沉积相,认为本区主要发育浅湖、半深湖、滨(浅)湖等沉积相,该项研究将对本区后续的生物气勘探起到一定的理论指导作用。
Biogas exploration in the Hohhot Depression in Hetao area has become a new area of Changqing Oilfield looking for reserve. At present, the research on biogas exploration in this area is low. In this paper, three types of seismic facies are identified in the seismic reflection of the Quaternary Pleistocene by using the seismic reflection characteristics such as amplitude, continuity, internal structure and external morphology of the seismic reflection wave: moderate-strong amplitude continuous reflection parallel-sub Parabolic seismic facies, variable amplitude discontinuities and parallel to the continuous reflection - sub-parabolic seismotectonic facies and chaotic seismic facies. The seismic facies plane distribution map of the study area was compiled. Single-well sedimentary facies analysis was carried out on wells 1 and 5 using single-well data. After comprehensive analysis, the seismic facies is transformed into sedimentary facies. It is considered that the sedimentary facies of shallow lakes, semi-deep lakes and shallow (shallow) lakes are mainly developed in this area, which will provide some theoretical guidance for the subsequent biogas exploration in this area effect.