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GENETIC TYPES AND DISTRIBUTION RULES OF THIN SAND LAYERS IN THE FOURTH MEMBER OF SHAHEJIE FORMATION IN SHUBEI AREA OF THE WESTREN SAG, LIAOHE DEPRESSION |
SONG Bing1, WANG Bo1, LIU Xing-zhou2, LIU Shao-zhi1, Chen Xi-guang1, Lu Wen-zhong1 |
1. Hangzhou Institute of Geology, CNPC, Hangzhou 310023, China; 2. Research Institute of Petroleum Exploration and Development, Liaohe Oilfeld Branch, CNPC, Panjin 124010, Liaoning Province, China |
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Abstract To determine the genetic types and distribution rules of thin sand layers in the fourth member of Shahejie Formation (Es4) in Shubei area of the western sag, Liaohe Depression, the paper summarizes the identification marks of thin sand layers of different genesis based on the characteristics of core, logging response and seismic reflection, and predicts the distribution of sand bodies of each sand group, as well as the controlling factors of sand body development and sedimentary models. The results show that the Es4 in the area belongs to fan delta-lacustrine sedimentary system. The thin sand layers have 4 genetic types, including underwater distributary channel, low-uplift bar, estuary dam and coastal shoal, among which the former two are dominated. The paleo-landform, paleo-provenance and paleo-water depth control the distribution of sand bodies. Divided by Shuguang and Xinglongtai buried hills, the south is the fan delta sedimentary area where the front subaqueous distributary channel and estuary dam are developed; while the north (including low-uplift area) is a semi-closed bay area without obvious water injection where the low-uplift beach bar sand body and limestone/dolomite flat are mainly developed, with coastal shoals along some areas of western coast. The largely developed low-uplift bar sand body outside the reserve area is a potential substitution for the increasing reserves and production of clastic rocks.
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Received: 02 November 2020
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