Study of the relationship between lithostratigraphic reservoirs and lakeshore line:An introduction on lakeshore line controlling oil /gas reservoirs in sag basin
Online published: 2007-03-15
According to the study of the relationship between the distribution of lithostratigraphic reservoirs and lakeshore line,the result shows that the most favorable facies tracts of lithostratigraphic reservoirs are alone lakeshore line.In brief,lakeshore line controls the distribution of sands,traps and oil reservoirs.The followings are characters of lithostratigraphic reservoirs distributional one lakeshore line: ① Alone lakeshore line there are multiple kinds of sedimental sandbodies in littoral and shallow lake to form different oil reservoirs. ② Shore line migration is cycling and episodic so there are the best conditions provided for reservoir-seal assemblage formations. ③ Various lithostratigraphic traps can form different reservoirs, such as coastwisebar,shore sandstone,lacustrine bay sandstone and stratigraphic unconformity reservoirs;reservoir-forming mechanisms include that unconformity and trench systems link up the source rocks for lateral migration of oil and gas but longitudinal migration depends on faults. ④Lithostratigraphic reservoirs are in belt and in scale alone lakeshore line. The stratigraphic overlap reservoirs are mainly located near the shore lines of LST and TST. The stratigraphic of flap reservoirs are mainly near the shore line of RST. But the reservoirs of coastwise bar,lacustrine bay sandstone and shore sand occur in each tract.
Key words: Baorao Trough; Aershan Formation; sequence stratigraphy; subtle reservoir
YI Dinghong , SHI Lanting , JIA Yirong . Study of the relationship between lithostratigraphic reservoirs and lakeshore line:An introduction on lakeshore line controlling oil /gas reservoirs in sag basin[J]. Lithologic Reservoirs, 2007 , 19(1) : 27 -31 . DOI: 10.3969/j.issn.1673-8926.2007.01.005
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