Digital characterization and connectivity analysis of microcosmic pore structures of the Ordovician bioturbated carbonate rock reservoirs in Tahe Oilfield
Niu Yong-Bin1, Xu Zi-Lu1, Liu Sheng-Xin2, Zhong Jian-Hua3, Zhao Jia-Ru1, Wang Pei-Jun4
1 College of Resource & Environment,Henan Polytechnic University,Henan Jiaozuo 454003,China; 2 Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China; 3 School of Geoscience,China University of Petroleum(East China),Shandong Qingdao 266580,China; 4 Development Affairs of Tarim Oilfield,PetroChina,Xinjiang Korla 841000,China
Abstract：Large-scale bioturbated carbonate rock reservoirs are developed in Ordovician Yingshan and Yijianfang Formations in the Tahe Oilfield. On the basis of core observation and detailed description,through observing thin sections under polarizing microscope,cathodoluminescence microscope and scanning and analyzing the plugs by using X-ray microscope,we have conducted digital characterization of pore structures and connectivity analysis of microcosmic pore structures of the Ordovician bioturbated carbonate reservoir rocks in Tahe Oilfield of Tarim Basin. The results show that: (1)Because of the great difference in rock fabric between burrow fills and surrounding host rock matrix,these reservoirs are highly heterogeneous. (2)The burrow fills are mainly composed of euhedral or subhedral dolomite crystals. The pore volume sets are between 10~100 μm3,the throat radii are generally smaller than 10 μm,and the throat lengths are generally shorter than 40 μm. The dolomite intercrystalline pores are the main reservoir space for this type of reservoir,and various pores are not well developed in the host rock matrix. (3)The porosity of burrow fills is between 7% and 10%. Although the number of isolated pores is large,the volume of connected pores still accounts for a large proportion. Moreover,the topology structure of connected pores is complex,and the pore network connectivity is overall great. Through coarsening and upgrading of Representative Elementary Volume(REV)in the scale,it is found that the pores in the samples are locally connected,while the overall connectivity is relatively poor. This study accurately characterized the micro-pore structures of the bioturbated carbonate reservoirs,which can provide the required characteristic parameters for the subsequent micro-seepage simulation of the bioturbated carbonate reservoirs. In future,the digital characterization of pore structure and the microcosmic seepage simulation of this type of bioturbated carbonate reservoirs should be combined with the macroscopic distribution rules and applied to the actual reservoir evaluation,which can provide guidance for the estimation of oil-gas resources, optimization of development plans, prediction of productivity and enhancement of oil-gas recovery.
Niu Yong-Bin,Xu Zi-Lu,Liu Sheng-Xin et al. Digital characterization and connectivity analysis of microcosmic pore structures of the Ordovician bioturbated carbonate rock reservoirs in Tahe Oilfield[J]. JOPC, 2020, 22(4): 785-798.
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