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lue lun liao he xi bu ao xian you qi cang lei xing ji qi fen bu gui lv
Author(s): 
Pages: 149-157
Year: Issue:  2
Journal: Oil & Gas Geology

Keyword:  断块油气藏油气藏类型辽河西部凹陷分布规律下第三系生油层沙河街组油水界面沙三段储集层;
Abstract: The western Liaohe depression began its developing at Oligocene andkept on sinking ever since.Now,the thickness of sediments with abundantorganic matters reaches 5,000—6,000m.Because of the later Tertiary frac-turings and foldings resulting from the progressive warping and epigenetictectonic movements,sequences of source rocks and varieties of traps favour-able to oil and gas generation and accumulation were formed.Four catigories of oil and gas pools are found,which are subdivided intonine types of different traps,such as:1).tectonic pools,including a).anticline;b).faulting blocks;and c).faulted structural noses;2).stra-tigraphycal pools,including d).overlaps;and e).uncomformities;3).basement pools,including f).latent ridges;and g).uncomformities of base-ment;and 4).lithological pools,including h).lenticular sandstones;andi).pinched layers.All these pools are regularly distributed in differentparts,superimposing each other.They can be summarized as two series ofoil and gas pools:1).anticlinal series and 2).slope series.They can be used as models for arranging exploration and appointing places favourable tooil and gas searching.The depression appears in shape of dustpan.Therefore,the oil and gastraps were formed in direction from margin to centre;whereas maturation ofoil and gas began from central parts towards margin.This kind of relation-ship between tectonic and oil generation processes implies certain regularitiesof special distribution of oil and gas pools and can lead to discovering ofpossible pools in some places else.
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