收稿日期: 2017-11-08
修回日期: 2018-03-06
网络出版日期: 2018-04-10
基金资助
“十三五”国家科技重大专项(编号：2016ZX05060001)资助.
Prospect of the deep marine shale gas exploration and development in the Sichuan Basin
Received date: 2017-11-08
Revised date: 2018-03-06
Online published: 2018-04-10
龙胜祥，冯动军，李凤霞，杜伟 . 四川盆地南部深层海相页岩气勘探开发前景[J]. 天然气地球科学, 2018 , 29(4) : 443 -451 . DOI: 10.11764/j.issn.1672-1926.2018.03.007
Shale gas exploration and development in Sichuan Basin had achieved a major breakthrough.But business development focused only on marine shale gas in shallow layers (vertical depth<3 500m) of Wufeng Formation-Longmaxi Formation.Therefore，business development of deep shale gas (vertical depth >3 500m) in Wufeng Formation-Longmaxi Formation is the key to the rapid growth of shale gas production in the Sichuan Basin.In the literature，authors analyzed the geological characteristics of deep shale gas of Wufeng Formation-Longmaxi Formation in southern Sichuan Basin through particular dissection and analysis of deep wells，comparing with the shallow layers.The thickness of organic-rich shale in deep region of southern Sichuan Basin is more than 120m，which is larger than that of shallow layers in Fuling.The vertical TOC change is the same，and the thickness of high quality shale is about 40m in the two regions，but RO is higher in the deep region of southern Sichuan Basin.The calcareous content of the organic shale increases，and the silicon content decreases from Fuling gas field to the deep region in southern Sichuan Basin.Research shows that the shales in Wufeng Formation-Longmaxi Formation of the southern Sichuan Basin from deep to shallow layers do not have so much differences in depositional environment，lithology，TOC，etc.There are four major differences：the porosity of shale in deep region of Southern Sichuan Basin is higher than that in Fulin because of denudation pore.The gas-bearing properties is better in deep region of southern Sichuan Basin with better preservation condition than that of shallow region in the Fuling gas field，but the gas-bearing property is worse in the local region with stronger structure deformation and the basin boundary fault zone.The shale gas resource in the deep region of southern Sichuan Basin is great and has wide prospects for exploration and development.In order to make breakthrough in deep shale gas commercial development as soon as possible，the authors propose the follow works as：Strengthening evaluation of small layer contrasting，fine structure explanation，fracture prediction；strengthening research of drilling and fracturing technology for deep shale gas；strengthening research of the wells column and supporting technology for efficient production of shale gas.
Key words： Sichuan Basin; Lower Silurian; Longmaxi Formation; Deep shale gas; Marine facies
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