SEDIMENTARY CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF SHALLOW SEA GRAVITY FLOW DEPOSITS IN THE GAS FIELD D, YINGGEHAI BASIN
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摘要:
莺歌海盆地D气田发育浅海重力流沉积，目前对于其沉积微相组成及特征存在较大争议。通过总结研究区岩石相、测井相、地震相综合特征，结合国内外海底扇沉积单元划分，考虑靶区实际情况，建立了适合D区的浅海重力流沉积微相划分方案，识别出侵蚀水道、水道侧缘、分流水道、朵叶体等多种沉积微相；总结不同沉积微相特征，建立了浅海重力流沉积微相识别图版；并在浅海重力流沉积模式的控制下，精细刻画沉积微相，识别沉积微相平面展布，为气田开发实施奠定基础。
Abstract:Shallow sea gravity flow deposits are well developed in the Gas Field D of the Yinggehai Basin. So far the composition and characteristics of the sedimentary microfacies of the shallow sea gravity flow deposits have remained controversial. In this study, we summarized the characteristics of the lithofacies, logging facies and seismic facies of the field. A schematic classification of shallow-gravity flow microfacies suitable for the Gas Field D is established upon the known classifications of marine fan depositional systems both domestic and abroad in addition to the geological background of the target area. Sedimentary microfacies of erosional channel, channel side, distributary channel and depositional lobe are identified. Based on the above researches, this paper proposed an identification plate for shallow sea gravity flow deposits. According to the sedimentation model of the shallow submarine fan, the spatial distribution pattern of microfacies of the Gas Field D is confirmed.
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