Lithologic Reservoirs ›› 2010, Vol. 22 ›› Issue (1): 37-42.doi: 10.3969/j.issn.1673-8926.2010.01.007

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Unconformity surface and hydrocarbon migration and accumulation in Chengbei fault step belt of Dagang Oilfield

GAO Changhai1， ZHA Ming2   

  1. 1. Postdoctoral Training Center， China University of Petroleum， Dongying 257061，China； 2. Faculty of Geo-Resources and Information， China University of Petroleum， Dongying 257061，China
  • Online:2010-03-15 Published:2010-03-15

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Abstract:

There are many unconformity surfaces in Chengbei fault step belt ofDagangOilfield, which are very important for hydrocarbon to migrate with long-distance and in great-scale and to accumulate. Seismic section comprehensively interpreted to discover that patterns of unconformity sections in Chengbei fault step belt include truncation conformity, fault-fold unconformity, fold unconformity, onlap unconformity and parallel unconformity. Each of them has the different distributing regularities, and the type of unconformity surface controls hydrocarbon migration. On the basis of analyzing log responses and cores, the unconformity surfaces in vertices are divided into three parts: basal conglomerate, weatheringmudstone and semi-weathering rock, this structure forms the double paths of the hydrocarbon migration. It connects reservoirs and faults which formed in different times to construct the regional migrating network. The unconformity surfaces in Chengbei fault step belt not only are the important paths for the hydrocarbon migration, but also are the good places for the hydrocarbon accumulation. The Chengbei fault step belt forms various reservoirs under the control of the vertical structure and types of unconformity surface.

Key words: seismic reflection characteristics, depositional mechanism, thick sand bodies, lake rim canyon, lithologic reservoirs, southern Songliao Basin

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