Karst monadnock fine characterization and reservoir control analysis: A case from Ordovician weathering paleokarst reservoirs in Lungu area, Tarim Basin, NW China
ZHANG Yunfeng1,2, TAN Fei1, QU Haizhou1,2, ZHONG Zhiqi3, LIU Yong4, LUO Xinsheng3, WANG Zhenyu1,2, QU Fang1,2
1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China; 2. The Sedimentary and Accumulation Department of Key Laboratory of Carbonate Reservoirs, PetroChina, Southwest Petroleum University, Chengdu 610500, China; 3. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, China; 4. Development Division of PetroChina Tarim Oilfield Company, Korla 841000, China
Abstract：Based on the fine characterization of weathering crust paleokarst landform of the Ordovician Yingshan Formation in Lungu area, Tarim Basin, the size, number and reservoir controlling characteristics of karst monadnocks have been investigated quantitatively. Impression method and karst monadnock volume formulas were employed to characterize the various levels of karst microtopography, to work out the number, relative relief, area, volume and other parameters of monadnocks, and analyze the reservoir development situation at different parts of monadnock. The results showed that the weathering crust karst reservoirs in Lungu area are 140-160 m in relative altitude, and thinning from karst highland to karst slope and terrace. Two hundred fifty-two karst monadnocks have been identified in the study area. Among them, typeⅠand typeⅡmonadnocks are fewer in number, but larger in bulk volume, and are favorable reservoir development zone. The monadnocks have a high coincidence ratio with current structural high points of 96.42%, and the monadnock morphology has remained basically unchanged during the late tectonic movement, thus “karstification-reservoir-accumulation” configuration has been kept good. In the main part (core) of karst monadnocks, there are cave, vug, fracture-vug, and fracture reservoirs, thicker high quality reservoir, and all reservoir parameters are better than those of karst monadnock wings. It is found that the relative amplitude of karst monadnock is positively correlated with single well productivity, and the scale and position of monadnock are closely related with productivity.
张云峰, 谭飞, 屈海洲, 钟治奇, 刘勇, 罗新生, 王振宇, 渠芳. 岩溶残丘精细刻画及控储特征分析——以塔里木盆地轮古地区奥陶系风化壳岩溶储集层为例[J]. 石油勘探与开发, 2017, 44(5): 716-726.
ZHANG Yunfeng, TAN Fei, QU Haizhou, ZHONG Zhiqi, LIU Yong, LUO Xinsheng, WANG Zhenyu, QU Fang. Karst monadnock fine characterization and reservoir control analysis: A case from Ordovician weathering paleokarst reservoirs in Lungu area, Tarim Basin, NW China. Petroleum Exploration and Development, 2017, 44(5): 716-726.
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2017, Vol. 44 
