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Jurassic tight oil & gas resources in East Sichuan Basin: A new exploration target

Wang Shiqian1,Hu Suyun2,Dong Dazhong2(1.Research Institute of Exploration & Development,Southwest Oil & Gasfield Company,PetroChina,Chengdu,Sichuan 610051,China;2.Petroleum Exploration & Development Research Institute,PetroChina,Beijing 100083,China)  
The Jurassic hydrocarbon exploration and development have always focused on the middle and west of the Sichuan Basin but ignored the huge hydrocarbon resources and great exploration potential in the east of this basin.This virgin land has been left there unexplored and undeveloped over the past almost 6 decades.In reality,a great volume of oil and gas shows have been discovered in many wells targeting the Jurassic pay zones in East Sichuan Basin,even industrial oil and gas flows have been achieved in a few cases.A preliminary study shows that there are good conditions in this virgin land for the formation of hydrocarbon reservoirs,very similar to those in Middle Sichuan Basin: great thickness of source rocks,tight reservoirs,rich hydrocarbon resources,etc.Thus,this virgin land will become another prospective area favorable for the exploration of original oil and gas reservoirs in this basin.Therefore,this paper suggests that the Jurassic tight oil and gas reservoirs in East Sichuan Basin should be taken as an important new target;overall assessment and specific Jurassic exploration should be carried out;pilot tests for horizontal wells and reservoir stimulation should be made in the low,buried structures or the wide synclines with better preserving conditions by use of such exploration evaluation technologies and methods for the discovery and exploitation of unconventional hydrocarbon resources.Compared with shale gas exploration in the complex areas like the structure in the southeastern Chongqing,oil and gas exploration in the Jurassic of East Sichuan Basin is of lower geological risk and exploitation cost but of higher success rate and opportunity of delivering oil and gas resources and putting into commercial production,therefore it is more realistic and inevitable to discover large-scale hydrocarbon reservoirs or fields.
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