Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (4): 1030-1041.doi: 10.13278/j.cnki.jjuese.201504107

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Oil/Gas Potential Predication of Liaohe Offshore Area Based on Analogical Analysis for Petroleum Geology Between Continental and Subsea

Yang Guangda1, Zou Bingfang1, Wang Shukun1, Wang Chun1, Han Xu2   

  1. 1. Research Institute of Petroleum Exploration & Development, Liaohe Oilfield Company, Panjin 124010, Liaoning, China;
    2. Petroleum Engineering College, Yangtze University, Wuhan 430100, China
  • Received:2014-10-25 Published:2015-07-26

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Abstract:

Offshore area refers to the region covered by 5 meters seawater or less. Liaohe basin extends to Liaodong Bay, and it is a crucial area of oil and gas exploration for Liaohe oilfield. Because of the restrictions such as mining right and environmental protection, oil and gas exploration of this area progressed very slowly in the past although the land part of the basin has been well studied and explored since 1970's. The both parts of the land and under sea water are geologically similar concerning their structure and sequential stratigraphy. The authors take the offshore and land as a whole, delineate the hydrocarbon accumulation conditions of the area involving in structure, stratigraphic framework, source in the area rocks, and hydrocarbon reservoir. The detailed correlation of the geological conditions was analyzed between the land and under sea. With the analogy of oil and gas accumulation factors, oil and gas exploration potential of the offshore area is predicted. It was indicated that Bijialing-Lingnan slope is the best place to be a lithological reservoir. The related favorable factors are as follows: 1)the slope coupled with various slope breaks forms a perfect zone for oil and gas migrating; 2)multi-directional provenances resulted in the sandstone-rich region; 3)slope belt controls the distribution of sand body and sedimentary facies, resulting in interbedding of the sand-mud deposits; 4)the slope belt is adjacent to the hydrocarbon-rich sag, and therefore constitutes a favorable association of source, reservoir, and cap rocks,by which lithologic reservoirs is easy to form. Accordingly, the authors indicate that the lithological reservoir in Bijialing-Lingnan slope belt is the main exploration target in the offshore area. The outcomes can be suitable for the oil and gas exploration of the seashore area in the other oil fields in Bohai Bay basin to some extent.

Key words: Liaohe basin, seashore area of the Liaodong Bay, Bohai Bay basin, reservoir bed, oil and gas, hydrocarbon source rocks, slope break zone, slope zone

CLC Number: 

  • P618.13

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