Progress,future direction,and challenges of natural gas exploration in the Bohai Bay Basin
The Bohai Bay Basin is rich in oil and natural gas resources,but overall there is more oil than natural gas.With the implementation of the national"dual-carbon"goal,the exploration and development of natural gas which is a kind of low-carbon clean and transitional energy is increasingly important and urgent.In order to further clarify the resource potential and future exploration direction of natural gas in the Bohai Bay Basin,this paper defines the distribution of natural gas resources in the Bohai Bay Basin based on the characteristics of regional tectonic evolution and source rock development.In addition,geological theories and exploration technologies are innovatively developed,and favorable areas and challenges to natural gas exploration are identified through comprehensive analysis and analogy.And the following research results are obtained.First,two sets of principal gas source rocks are developed in the Bohai Bay Basin,namely,the Carboniferous-Permian coal measure layer and the Eocene lacustrine layer.Based on the simulation analysis of hydrocarbon generation and expulsion of source rocks,the total natural gas resources in the Bohai Bay Basin are estimated to be about 6.60× 1012 m3,of which 2.92× 1012 m3 lies in the Bohai Sea area,accounting for nearly half of the total.Second,in recent years,important innovative understandings have been obtained by researching the accumulation geological theories and exploration technologies for deep natural gas in the Bohai Sea area,including explosive hydrocarbon generation of the Eocene lacustrine source rock in the late stage,large-scale reservoir formation of buried hills,sealing of compressive and torsional faults in buried hills,multi-channel hydrocarbon supply in buried hills,wide azimuth seismic imaging and fracture prediction technology.Third,based on the new geological understandings,combined with analog analysis,it is indicated that 10 deep and large depressions with one or two sets of principal gas source rocks are the favorable areas for future natural gas exploration,including Bozhong,Liaozhong,and Western depressions.Fourth,from the stratigraphic perspective,the"double ancient"areas(Paleozoic and buried hill)are the main layers for natural gas exploration.The main exploration targets in the Paleogene are the Shahejie Formation hgbrid sedimentary and the Dongying Formation sublacustrine fan.In conclusion,the research results clarify the favorable zones,favorable layers,and challenges to the future natural gas exploration in the Bohai Bay Basin,so as to strengthen the confidence of large-scale natural gas reserves and production increase in the Bohai Bay Basin in the future and point out the next direction.
Bohai Bay BasinDeep natural gas explorationExplosive hydrocarbon generationBuried hillPaleogeneFuture directionChallenge
万方数据
维普
