Three-dimensional reconstruction and their significance of bioturbation-type reservoirs of the Ordovician in Tahe Oilfield
Niu Yong-Bin1,2, Cui Sheng-Li1, Hu Ya-Zhou1, Zhong Jian-Hua3, Pan Jie-Nan1
1 Institute of Resource and Environment,Henan Polytechnic University,Jiaozuo 454003,Henan; 2 Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province,Jiaozuo 454003,Henan; 3 School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong
Abstract：This paper studied the bioturbation-type reservoirs well-developed in the Ordovician Yingshan and Yijianfang Formations of the Tahe Oilfield based on core observation,cathodoluminescence microscopy,three-dimensional X-ray microscope,and X-ray diffractometer. Two kinds of trace fossils (i.e.,Thalassinoides and Helminthopsis) were identified;the former is most prevalent with the bioturbated volume up to 90%. The burrow infillings are composed mainly of dolomite,accounting for more than 90%. The host rock is micrite. Along with the change of depositional environment during the Early-Middle Ordovician transgression and regression in Tahe Oilfield,burrows also show obvious periodicity. Three-dimensional geological model of the bioturbation-type reservoir in the study area was established using the three-dimensional reconstruction software package by 3ds Max software. This study visualizes the internal structures and microscopic features of the bioturbation reservoir in Tahe Oilfield and provides a solid academic basis for subsequently investigating macro-heterogeneity and micro-anisotropy,quantitatively characterizing the percolation characteristics on the microscopic scale of those bioturbation reservoirs. In addition,it also provides a new idea to improve and perfect the model of Ordovician reservoir of Tahe Oilfield.
Niu Yong-Bin,Cui Sheng-Li,Hu Ya-Zhou et al. Three-dimensional reconstruction and their significance of bioturbation-type reservoirs of the Ordovician in Tahe Oilfield[J]. JOPC, 2018, 20(4): 691-702.
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