The analysis of the controlling effect of the fault zone internal structure on oil and gas migration is the weak point of hydrocarbon accumulation in Hala’alat Mountain tectonic belt.According to the data of outcrops,drilling cores,(imaging) logging and rock slice microscopy,the internal structure of fault zone was identified and divided,and the reverse fault zone structure model in volcanic rock area was established.Based on the fault zone structural occurrence measurement,homogenization temperature of fluid inclusions,the carbon,oxygen and strontium isotope geochemistry,the results show that the evolution model of fault zone is from two-dimensional fault plane to three-dimensional geological body step by step,which extended from the inside to outside.The spatial heterogeneity of fault zone,the difference of evolution and reservoir forming geological conditions,which is the “four-dimensional” attribute of the fault.The relationship between reservoir and well is dissected,and the controlling effect of internal structure of fault zone on hydrocarbon migration and accumulation is discussed.Conversion of oil and gas transmission,the periodicity and timeliness of the transport,and the hydrocarbon accumulation in different partsare controlled by the characteristics of fault zone,which is the “four-dimensional” attribute of the spatial heterogeneity and the time evolution differences.The fractured zone and induced fracture zone have good conductivity during the period of active fault and after stopping activities to quite a long time (2.9-9.8Ma) before complete filling cementation.The trap juxtaposition or direct linked with mid-high angle fault in shallow and the trap of low-mid angle thrust fault footwall in deep are the favorable exploration targets.
Wang Sheng-zhu, Wu Qian-qian, Song Mei-yuan, Yu Hong-zhou, Zhang Guan-long
. Quantitative evaluation of the transportation of fault zoneand its controlling effect on hydrocarbon migration and accumulation:Case study of Hala’alat Mountain tectonic belt in the north margin of Junggar Basin[J]. Natural Gas Geoscience, 2018
, 29(11)
: 1559
-1567
.
DOI: 10.11764/j.issn.1672-1926.2018.09.002
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