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Key Factors of Oil-gas Reservoir-forming and Exploration Targets in Ordovician in Tazhong Area,Tarim Basin

Zhao Zongju1,2, Jia Chengzao1,Zhou Xinyuan2 and Wang Zhaoming 2 // 1 PetroChina Research Institute of Petroleum Exploration and Development, Beijing100083; 2 Postdoctor Workstation of PetroChina Tarim Oilfield, Korla City, Xinjiang 841000  
Synthetically analyzing on the oil-gas pools formation and losing reasons of over 60 drilling wells in Ordovician in Tazhong area, Tarim basin, the key factors to form Ordovician oil-gas reservoirs in this area are as below: (1)the important source rocks, which are corresponding to Heituwa Formation and Sha'ergan Formation in Middle-Upper Ordovician, control the distribution of oil and gas in northern slope of Tazhong uplift; (2)the distribution and heterogenesis of four sets of carbonate reservoirs, such as paleo-burial hill karst reservoir generated from Silurian to Devonian (EKR-1), paleo-burial hill karst reservoir formed from later Middle Ordovician to early Late Ordovician (Liandeilo to early Caradoc) (EKR-2), shelf marginal reef-shoal burial karst reservoir in Upper Ordovician Lianglitage Formation and Lower Ordovician interlayer dolomite reservoir , play a very important role in forming diagenetic-lithologic oil-gas traps; (3)the main reservoir-forming stage of commercial oil reservoirs at present would be from Permian to Early Triassic in Tazhong area; (4) the conditions of traps, cap rocks and oil-gas conservation controlled the scale of oil-gas pools. As to oil-gas exploration targets and steps of Ordovician in Tazhong area, it is suggested that three stages should be conducted, including in the near term, the ultra-large lithologic oil-gas reservoirs of Lianglitage Formation distributed in shelf marginal reef-shoal in the southern side of Tazhong-I fault belt should be firstly explored, at the same time, the Lower Ordovician oil-gas pools distributed in eastern part of central fault-horst belt from Tazhong- 401 to Tazhong-9 well block should also be explored; secondly, the paleo-burial hill oil-gas pools in the middle and upper part of Yingshan Formation in Lower Ordovician distributed in Tazhong-10 structural belt and the area between it and central fault-horst belt, and Lower Ordovician in the area of Tazhong-1-Tazhong-7-Tazhong-48 well blocks should be explored; if existing the fault to link source rocks, the structural and stratigraphy traps with turbidite sandstones, shelf-delta, and shore-tidal sandstones in Upper Ordovician in Manjia'er sag can be explored.
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