Formation mechanism for the high-quality reservoir in the Chang 82 Interval of Yanchang Formation in Longdong area, Ordos Basin
Xu Liming1, 2, 3, Li Zhicheng1, Liang Xiaowei2, 3, Ji Youliang1, Niu Xiaobing2, 3, Ye Bo2, 3, Hao Bingying2, 3, Ma Jiye2, 3, You Yuan2, 3
1 State Key Laboratory of Petroleum Resource and Prospecting,College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 National Engineering Laboratory for Exploration and Development of Low-permeability Oil & Gas Field,Xi�an 710018,Shaanxi; 3 Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina, Xi�#x0ddb3;an 710018,Shaanxi;
Abstract：The reservoirs of the Chang 82 interval of Yanchang Formation in Longdong area of Ordos Basin have low porosity(average 8.8%)and low permeability(average 0.64×10-3 μm2). The strong compaction is the main reason for the poor reservoir properties,and the carbonate cementation further reduces the reservoir physical properties. Although the reservoir physical property is generally poor,the high quality reservoirs have relatively high porosity and permeability are developed on the background of tight reservoirs. The high-quality reservoirs are analyzed and their typical characteristics are summarized. The statistical results show that the high-quality reservoirs have lower plastic component content,pore types are dominated by dissolution pores and residual intergranular pores cemented with chlorite, and pore structures are mainly small-medium pores with fine-medium throats. Based on the above understanding,the formation mechanism of the high quality reservoirs is analyzed. The study suggests that:High energy and thick sandbodies of distributary channel,mouth bar,etc., are conducive to form high-quality reservoirs;relatively low plastic component content and chlorite rim are in favor of preservation of intergranular pores; and dissolution is the most important diagenesis for the formation of secondary pores.
Xu Liming,Li Zhicheng,Liang Xiaowei et al. Formation mechanism for the high-quality reservoir in the Chang 82 Interval of Yanchang Formation in Longdong area, Ordos Basin[J]. JOPC, 2016, 18(2): 237-250.
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