Volume 46 Issue 9
Oct.  2021
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Article Navigation >  Earth Science  > 2021  >  46(9): 3189-3202
Wang Feilong, Tang Guomin, Chen Rongtao, Wang Guangyuan, Yu Qian, 2021. Thickening Mechanism and Reservoir Formation Model of Bozhong 29-6 Oilfield in Huanghekou Sag, Bohai Bay Basin. Earth Science, 46(9): 3189-3202. doi: 10.3799/dqkx.2020.331
Citation: Wang Feilong, Tang Guomin, Chen Rongtao, Wang Guangyuan, Yu Qian, 2021. Thickening Mechanism and Reservoir Formation Model of Bozhong 29-6 Oilfield in Huanghekou Sag, Bohai Bay Basin. Earth Science, 46(9): 3189-3202. doi: 10.3799/dqkx.2020.331
shu

Thickening Mechanism and Reservoir Formation Model of Bozhong 29-6 Oilfield in Huanghekou Sag, Bohai Bay Basin

doi: 10.3799/dqkx.2020.331

  • Tianjin Branch, CNOOC, Tianjin 300459, China

  • Received Date: 2020-09-08
    Available Online: 2021-10-14
  • Publish Date: 2021-10-14
    Abstract
  • Bozhong 29-6 oilfield is located in the northern steep slope zone of Huanghekou sag, which has a favorable position for hydrocarbon supply from double depressions. It has been found that the crude oil is characterized by thickened oil as a whole, and the characteristics of biomarkers are complex and diverse, and the source of oil-gas and the genetic mechanism of thickened oil are not clear. Based on previous studies and crude oil analysis, by using geochemical analysis method, the source and thickening mechanism of heavy oil in Bozhong 29-6 oilfield are clarified, and the thickening model and reservoiring model are established. The results show that (1) Bozhong 29-6 oilfield has the characteristics of double-depression mixed hydrocarbon supply. The high sulfur-oil mainly derives from the eastern depression of the Huanghekou sag, while the low sulfur-oil mainly derives from the middle depression of the Huanghekou sag; (2) Bozhong 29-6 oilfield group is of shallow heavy oil, and its crude oil properties are controlled by the combination of three factors, namely, secondary filling, fault activity and parent source characteristics. The properties of crude oil are controlled by the combination of three factors which are secondary charge, fault activity and maternal characteristics. Based on three factors, four oil thickening modes are identified, including immature-weak faulting-weak secondary charge, mature-strong faulting-weak secondary charge, mature-strong faulting-strong secondary charge, immature-strong faulting-strong secondary charge. (3) Bozhong 29-6 oilfield has double depression hydrocarbon supply and accumulation mode, which varies with the distance to the sag. Single depression hydrocarbon supply vertical transportation fault strong filling strong degradation heavy oil reservoir forming mode is formed near source, and double depression hydrocarbon supply sand body or unconformity lateral transportation weak filling strong/weak degradation heavy oil accumulation mode is formed at far source; the hydrocarbon supply from single depression near the source, vertical transportation of fault, strong/weak filling, strong degradation, and heavy oil accumulation mode above the source are formed, and the hydrocarbon supply sand body in double depression or unconformity lateral transportation weak filling strong/weak degradation heavy oil accumulation mode is formed in the far source. (4) The surrounding areas of Bozhong 29-6 oilfield can be divided into four zones: zone I has the best physical properties of crude oil, zone II and IV have the most severe thickening and the worst physical properties, and the crude oil in zone III is in the middle. Because the secondary filling can obviously improve the physical properties of crude oil, the exploration and development of medium light crude oil should select area I and area III.

     

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