Application of reverse-time migration technology in imaging of fractures and cavities in carbonate reservoirs

doi:10.3969/j.issn.1672-7703.2017.01.012

Abstract

Abstract: In the Tarim Basin, the Ordovician carbonate reservoirs are deeply buried with strong heterogeneity, and fracture-cavity reservoirs are widely distributed. Moreover, igneous rocks are extensively developed with thickness and shape greatly varying and velocity quickly changing. Subsequently, the images of underlying formations are often distorted, and the thickness characterization of low-relief structures is negatively influenced. Reverse-time migration (RTM) technology is characterized by adaptability to lateral velocity change and high imaging precision. With some key high-precision velocity modeling techniques (e.g. low-frequency velocity field establishment and update, highresolution velocity modeling, and hierarchical grid tomographic iteration), the background velocity field of the Tarim Basin is accurately inverted for reverse-time migration imaging. In this way, the pseudo-structures resulted from igneous rocks can be effectively eliminated and fracture-cavity imaging precision can be improved. As a result, the “paternoster” boundary and its spatial location can be accurately distinguished.

Key words: carbonate reservoir, igneous rock, lateral velocity change, high-precision modeling, reverse-time migration

CLC Number:

P631.4

Gao Houqiang, Xu Ying, Shao Wenchao, Mu Jie, Jiang Bo, Chen Zhe. Application of reverse-time migration technology in imaging of fractures and cavities in carbonate reservoirs[J]. China Petroleum Exploration, 2017, 22(1): 99-105.

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