Meandering channel sandstone architecture characterization based on architecture seismic forward simulation
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ORIGINAL PAPER
Meandering channel sandstone architecture characterization based on architecture seismic forward simulation Hongwei Liang 1 & Longxin Mu 1 & Zifei Fan 1 & Lun Zhao 1 & Xiaoqing Zhao 2 & Liangdong Zhao 1
Received: 22 January 2015 / Accepted: 26 February 2016 # Saudi Society for Geosciences 2016
Abstract To improve the accuracy of the meandering channel sandstone reservoir characterization in offshore oilfield, this article completes the meandering channel sandstone reservoir architecture characterization of the NmII-3 layer of Low Minghuazhen Group in the Qinhuangdao 32-6 oilfield by the architecture-guided seismic forward simulation based on the meandering river depositional mechanism. By the research mentioned above, the seismic forward simulation identification criteria of composited meandering channels boundaries are summarized that when the mud layer thickness is greater than or equal to 1 m and the channel sandstone thickness is between 8 and 9 m, the mud layer between composite meandering channels can be identified. The seismic forward simulation identification criteria of single meandering channels boundaries are summarized that the elevation difference which is greater than or equal to 5 m can be identified while the channel sandstone is greater than or equal to 7 m. And the seismic forward simulation waveform features of elevation difference of channels, small sandstone among channels, and abandoned channel are summarized. The seismic waveform of elevation difference has two side-by-side troughs. The seismic crest center position of large channel sandstone is lower than the seismic crest center position of the small sandstone. The seismic crest center falls slowly and rises quickly from convex bank to concave bank in abandoned channel laterally. Finally, the architecture-guided
* Xiaoqing Zhao [email protected]
1
Research Institute of Petroleum Exploration and Development, Beijing 100083, China
2
Bureau of Geophysical Prospecting Inc., CNPC, Zhuozhou City, Heber Province 072751, China
seismic forward simulation method is established and the applying criteria are summarized in this paper. And the accuracy of the meandering channel sandstone architecture characterization with well logs and seismic data is improved. Keywords Channel sandstone . Architecture . Meandering river . Minghuazhen Group . Qinhuangdao32-6 oilfield
Introduction Meandering river deposition is a key role of the fluvial delta sedimentary system in the continental basin (Liu et al. 2013). And it is also one of the most important kinds of sandstone reservoir (Miall 2006). The remaining oil distribution and water flooding in sandstone reservoir are mainly controlled by the inner structure and architecture of meandering river sandstone (Zhong et al. 2010; Gao et al. 2013; Wang et al. 2014). Based on the fluvial reservoir sandstone architecture classification (Miall 1988), the distribution patterns of meandering channel sandstone are summarized by the studying of outcrops and modern rivers (Fabuel-Perez et al. 2009; Con
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