库车前陆盆地中生界烃源岩有机质成熟度演化及影响因素

doi:10.11743/ogg20050613

Abstract

Abstract:

The main body of Jurassic source rock in Kuqa foreland basin is in its peak of oil generation,with R_o value in the range of 0.55%-1.88% and average value of 0.93%.While that of Triassic source rock is in its late period of oil generation,with R_o value in the range of 0.60%-2.59% and average value of 1.1%.The(available)borehole temperature measurements indicate that the temperatures at 2 000,4 000 and 6 000 m in Kuqa foreland basin vary in the range of 40-60℃,60-90℃,and 100-150℃,respectively.Thermal history restoration shows that Kuqa foreland basin has always been in relatively low heat flow conditions since Triassic. The surface heat flow was relatively high in Mesozoic(50-55 mW/m²)and has been continuously and slowly lowering since Cenozoic and finally to the contemporary 40-50 mW/m².The Triassic and Jurassic source rocks entered into low maturity stage in 160-170 Ma and 100 Ma respectively,and entered into gas generation stage in 145 Ma and 75 Ma respectively.The earliest area that entered into low maturity stage is Kelasu,followed by Qiulitage structural zone,and Baicheng sag was the last one.The maturity of organic matter began to increase remarkably since 23 Ma,and both the Triassic and Jurassic source rocks are in their gas generation stage now.The maturity of source rock is mainly controlled by sedimentary and burial history and thermal history of the basin.Overthrusting and gypsiferous rock have also certain influences on maturity of source rock,the intensity of which depends on the displacement of overthrust fault and the thickness and lateral variation of gypsiferous rock.

Key words: thermal history, overthrusting, gypsiferous rock, organic maturity, Kuqa foreland basin

CLC Number:

TE112.1

Yang Shuchun, Lu Qingzhi, Song Chuanzhen, Yuan Yusong, Wang Hongjun, Hu Shengbiao. Evolution of Mesozoic source rock's organic maturation in Kuqa foreland basin and its influence factors[J]. Oil & Gas Geology, 2005, 26(6): 770-777,785.

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Evolution of Mesozoic source rock's organic maturation in Kuqa foreland basin and its influence factors

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