Analysis of Main Controlling Factors for Hydrocarbon Accumulation in Yongjin Region of Junggar Basin
SHI Jian-nan
ZOU Hua-yao
LI Ping-ping
LIU Jian-zhang
Abstract：For studying the accumulation mechanism and enrichment rule in deeply-buried sub-tle oil/gas reservoirs in the hinterland of Junggar basin, the evolution and effects on oil accu-mulation of Che-mo palaeohigh and its related K/J unconformity, the relationship between charging histories and reservoirs evolution, the mechanism of overpressure development and subtle conduit pathway were amply discussed for Yongjin oilfield. The results show that the paleo-weathered soil layer of K/J unconformity develops widely and takes on favorable vertical sealing property (vertical permeability is less than 0.1 md), the semi-weathered layer experi-ences mainly physical weathering (CIA index is less than 75 %) and has strong lateral heteroge-neity;the reservoirs take on high porosity (from 10% to 15%) as hydrocarbon charging; and the strong static overpressure and natural hydraulic fractures develop widely under 4 500-5 500 m (the maximal pressure coefficient is close to 2.2). The main controlling factors of hy-drocarbon accumulation include charging time, main conduit pathway and trapping space type.
Keywords：charging historyconduit pathwayoverpressuresubtle oil/gas reservoirsJung-gar basin
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 384-389 )