Characteristics of carbonate gas pool and multistage gas pool formation history of Hetianhe gas field, Tarim Basin, Northwest China
Tóm tắt
Hetianhe is a big carbonate gas field which is found and demonstrated in the period of “Chinese National Ninth 5-Year Plan”. The proved reserve of Hetianhe gas field is over 600×108 m3. Its main producing layers are Carboniferous bioclastic limestone and Ordovician carbonate composed of buried hill. The former is stratified gas pool with water around its side, and the latter is massive gas pool with water in its bottom. The gases in the gas pools belong to dry gases with normal temperature and pressure systems. Based on the correlation of gas and source rock, the gases are mainly generated from Cambrian source rocks. According to the researches on source rock and structure evolution, and the observations on the thin section to reservoir bitumen and the studies on homogenization temperature of fluid inclusions, the gas pool has been identified and divided into three formation periods. The first is Late Caledonian when the oil generated from the Cambrian source rocks and migrated along faults, as a form of liquid facies into Ordovician carbonate reservoir and accumulated there. After that, the crust uplifted, the oil reservoir had been destroyed. The second is Late Hercynian when condensate gases generated from the Cambrian source rocks and migrated into Ordovician reservoir, as a form of liquid facies. Since the fractures had reached P strata, so the trap might have a real poor preservation condition, and the largescale gas pool formation had not happened. The third gas reservoir formation period occurred in Himalaya. The fractures on both sides of Hetianhe gas field developed violently under the forces of compression, and thus the present fault horst formed. The dry gases generated from Cambrian source rocks and migrated upwards as the form of gas facies into Ordovician and Carboniferous reservoirs, and the large gas pool as discovered at present was formed finally.
Tài liệu tham khảo
Cheng Yongwu, The characteristics of petroleum geology and exploration potencial in West China, Acta Petrolei Sinica (in Chinese), 1999, 20(6): 1.
Yu Xuemin, Su Junqing, Wang Zhensheng, Primary geological characteristics of oil and gas pool in buried hill of Qian Miqiao, Petroleum Exploration and development (in Chinese), 1999, 26(6): 7.
Ma Zhenfang, Zhou Shuxun, Yu Zhongping t al., The characteristics of ancient crust of weathering and its relationship with gas accumulation on top of Ordovician of east part of Ordous Basin, Petroleum Exploration and Development (in Chinese), 1999, 26(5): 21.
Dai Hongming, Wang Shunyu, Wang Haiqing, The characteristics of gas pool formation of Cambrian-Sinian gas system in Sichuan Basin and the beneficial exploration area, Petroleum Exploration and Development (in Chinese), 1999, 26(5): 16.
Lu Xiuxiang, Lu Xiuxiang, Jin Zhijun t al., The oil and gas accumulation and distribution of lower Palaeozoic carbonate rock in the Tarim Basin, Science in China, Series D (in Chinese), 1999, 29(4): 358.
Achar, M., Martine, M., Savard, M. t al., Hydrocarbon potential of the Mississippian carbonate platform, Bechar Basin Algerian Sabara, AAPG Bulletin, 2000, 84(2): 266.
Jia Chengzao, The structure characteristics and the rules of oil and gas accumulation, Xinjiang Petroleum Geology (in Chinese), 1999, 20(3): 177.
Lv Xiuxiang, Zhang Yiwei, Jin Zhijun t al., Primary discussion on pool formation cycle of Tarim Basin, Chinese Science Bulletin (in Chinese), 1996, 41(22): 2064.
Wang Qinghua, The structure characteristics on Bachu bulge and its control to oil and gas distribution, Xinjiang Petroleum Geology (in Chinese), 1999, 20(3): 208.
Yangwei, Wang Qinghua, Wangyuan et al., The relation between Carboniferous succession of strata and reservoir on Mazatage structure belt in Tarim Basin, Xinjiang Petroleum Geology (in Chinese), 1999, 20(3): 235.
Yangwei, Wang Qinghua, Liu Xiaozeng, The genesis of lower Ordovician dolomite in Hetianhe gas field of Tarim Basin, Acta Sedimentologica Sinica (in Chinese), 2000, 18(4): 544.
Dai Jinxing, Pei Xigu, Qi Houfa, China Natural Gas Geology (Vol. 1) (in Chinese), Beijing: Petroleum Geology Press, 1992, 5–146.
Feng Guoxiu, Cheng Shengji, Relationship between bitumen and vitrinite in sediment rock, Natural Gas Industry (in Chinese), 1988, 8(3): 20.
Huang Chuanbo, Formation condition of oil and gas pool in Cambrian-Ordovician carbonate rock of Tarim Basin, Xinjiang Petroleum Geology (in Chinese), 2000, 21(3): 188.
Zhang Baomin, Zhao Mengjun, Xiao Zhongyao et al., The characteristics of potential gas source rock of Tarim Basin, Xinjiang Petroleum Geology (in Chinese), 2000, 21(1): 33.
Xie Xiaoan, Hu Suyun, Lu Huafu, Discussion on normal-reverse structure of Bachu block dome in Tarim Basin, Geology Review (in Chinese), 1998, 44(1): 1.
Fu Jiankui, Zhang Guangya, Ma Jun et al., The structure type and evolution of Bachu in Tarim Basin, Petroleum Exploration and Development (in Chinese), 1999, 26(5): 10.
Dahl, B., Speers, G. G., Geochemical characterization of a tar mat in the Osebery field Norwegian sector, North Sea, Organic Geochemistry, 1986, 10(6): 547.
Wang Hongjun, Cai Yingchun, The general characteristics of fluid inclusion and its application on oil and gas pool formaition, Petroleum Exploration and Development (in Chinese), 2000, 27(3): 50.
Shi Jixi, Li Benchao, Fu Jiamo et al., Organic inclusion and oil and gas, Chinese science (in Chinese), Series B, 1987, 17(3): 318.
Liu Shaobo, Gu Jiayu, Application and discussion of inclusion in studying petroleum geology, Oil and Gas Geology (in Chinese), 1997, 18(4): 327.
Peters, K. E., Moldowan, J. M., The Biomarker Guide: Interpreting Molecular Fossils in Petroleum and Ancient Sediments (Translated by Jiang Naihuang et al.) (in Chinese), Beijing: Petroleum Industry Press, 1995, 1–100.
Cheng Jianping, Zhaming, Zhou Yaoqi, Summarization on organic inclusion used in oil and gas migration, Geological Science Information (in Chinese), 2000, 19(1): 61.
Jia Chengzao, Wei Guoqi, Yao Huijun et al., Basin structure evolution and regional structure geology, Oil and Gas Exploration Book, Beijing: Petroleum Industry Press (in Chinese), 1995, 88–98.