Oil & Gas Geology ›› 2018, Vol. 39 ›› Issue (6): 1154-1163.doi: 10.11743/ogg20180606

Previous Articles     Next Articles

Quantitative evaluation of provenance supply capacity for sandy conglomerates: A case study of Guojuzi subsag in Chezhen Sag

Wang Yanzhang1, Lin Hongmei2, Feng Jianwei3, Li Baojuan4, Cao Xiaoli5, Cai Hongxing6, Hu Qiuyuan1   

  1. 1. Shengli College, China University of Petroleum, Dongying, Shandong 257061, China;
    2. Research lnstitute of Petroleum Exploration and Development, Shengli Oilfield Company Ltd., SINOPEC, Dongyiug, Shandong 257015, China;
    3. School of Ceosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
    4. China Offshore Environmental Services Co. Ltd., CNOOC, Tianjin 300450, China;
    5. Shengli Branch of Geophysical Corporation Ltd., SINOPEC, Dongying, Shandong, 257093, China;
    6. Xianhe Oil Production Plant, Shengli Oilfield Company Ltd., SINOPEC, Dongying, Shandong 257068, China
  • Received:2017-06-21 Revised:2018-03-06 Online:2018-12-28 Published:2018-10-22

Abstract: Sandy conglomerates in steep slopes are characterized as various fan types,abundance of provenances,and high deposition rate,and the provenance supply capacity is one of the main factors controlling sandy conglomerate scale and its sedimentary system.However,the quantitative study of provenance supply is always a weak point which constrains the study of sedimentary system.In order to address the problem,we worked out the provenance supply index with weighted average of parameters which have positive and inverse relation with provenance supply rates.The calculation was based on the study of conglomerate content,ratio of sand and formation,lithologic index,development degree of interbed(frequency,thickness,percentage),mineral content,granularity distribution.And the results show that (1) the areas with high provenance supply indexes are mainly distributed in the north,close to the downthrown side of Chengnan fault,along large faults in the form of apron; (2) the provenance supply capacity determines the development scale of sandy conglome-rates:the distribution patterns and scales of sandy conglomerates beside plate-,shovel-,ladder- and slope-shaped boundary faults vary with the varying provenance supply capacities.In addition,a combination of the provenance supply capacity and depth of water controls the types of sedimentary facies.With the change of these two factors,the studied area has developed such sedimentary facies as fluvial facies,alluvial fan,carbonate rock,delta,fan delta,turbidite fan,sublacustrine fan,coastal subsea apron and so on.

Key words: provenance supply capacity, sedimentary facies, sandy conglomerate, Guojuzi area, Chezhen Sag, Bohai Bay Basin

CLC Number: