Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (4): 965-980.doi: 10.13278/j.cnki.jjuese.20170082

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Hydrocarbon Accumulation Condition and Controlling Factors of Block WA-406-P in Bonaparte Basin, Australia

Chen Aimin   

  1. CNOOC EnerTech-Drilling & Production Co, Tianjin 300452, China
  • Received:2017-10-27 Online:2018-07-26 Published:2018-07-26
  • Supported by:
    Supported by National Natural Science Key Foundation of China (41530315)

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Abstract: The Bonaparte basin is a superimposed basin where the intra-continental rift and passive continental margin are superimposed, and the block WA-406-P is located in the large Plover delta sedimentary system formed in Early-Middle Jurassic in this basin. In this study, the comprehensive analyses were conducted on oil & gas geology, experimental data, 3D seismic, well logging curves and so on, to find out the hydrocarbon accumulation conditions and controlling factors, and then to specify the next exploration target area. The research results show that in the block WA-406-P, two types of source rocks are developed:one is type Ⅱ1 in the northwestern region and the other one is type Ⅱ2 in the southeastern region. The reservoir is controlled by diagenesis for its capacity, and belongs to low porosity and high permeability reservoirs. Three sets of delta sand bodies in the Plover and Elang Groups of Middle-Lower Jurassic and the Flamingo Group of Upper Jurassic-Lower Cretaceous combined with large set of marine mudstones formed two sets of favorable reservoir and cover combinations. Because the traps formed earlier than the large-scale oil & gas migration and accumulation, the block WA-406-P had very good conditions for hydrocarbon accumulation when the reservoirs were filled within the two different periods. With the analysis of hydrocarbon accumulation conditions, the controlling factors of hydrocarbon accumulation were also determined. The main results indicate that the distribution characteristics of source rock control the fluid type of oil & gas reservoir, the structural morphology and fault distribution control oil & gas reservoir type, the reservoir properties control the abundance of geological reserves, and the fault activation effect controls whether oil & gas reservoir can be preserved. On the above analysis, the favorable exploration areas are determined as below:the first class is in the inter zone of horst and graben in the northern block, the second class is in the slope zone in the southwestern block, and the third class is in the trough zone in the southeastern block.

Key words: hydrocarbon accumulation condition, controlling factors, Jurassic-Cretaceous system, block WA-406-P, oil gas, Bonaparte basin, Australia

CLC Number: 

  • TE112.31
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