Analysis of Burial History and Thermal History in Yubei Area, Tarim Basin

Abstract

Abstract:

According to strata division data and the palaeo heat flow analysis, the authors simulated and analyzed the burial and thermal histories of 5 representative drillings in Yubei area, Tarim Basin. In this way, the thermal evolution and maturation processes of source rock are discussed and the mature stages of hydrocarbon source rock and hydrocarbon generation period are pointed out preliminarily in the study area. The research results show that the study area experienced several cycles of sedimentary burial, uplift and erosion during the deposition of Cambrian to Devonian. After the sedimentation of Devonian, Carboniferous-Permian layers show characteristics of sedimentary burial.In the Mesozoic, a few Triassic layers, having been eroded in the eastern of Yubei area, appeared sedimentary discontinuity in the central and western regions. In the Cenozoic, the strata deposited continuously and the deposition rate presented an increasing trend. In the study area, after the Cambrian hydrocarbon source rock had deposited, the maturity evolution appears relatively successive. Cambrian source rock came into the oil-generating window in the Ordovician, and the time of the hydrocarbon generation is early. In the Silurian-Devonian, influenced by the Early Hercynian, the strata underwent the uplift and erosion, and the evolution of the source rock was slow. With the stable sedimentary and the active volcano widely in Carboniferous-Permian, the source rock entered into the high mature stage. Because of the remote effect of the Himalaya Orogeny, with the area subsiding and very thick sediments deposited in the Cenozoic, the source rock reached the over-mature stage, where the gas gets generated.

Key words: Yubei area, source rock, burial history, thermal history, R_o, basin modeling

CLC Number:

TE122.1

NI Bin, TANG Liangjie, GUO Ying, YU Tengxiao, YUE Yong. Analysis of Burial History and Thermal History in Yubei Area, Tarim Basin[J]. Geoscience, 2017, 31(02): 357-366.

Figures/Tables 9

Fig.1 Tectonic setting of Yubei area,Tarim Basin

Fig.2 Stratigraphic column of Yubei area

Table 1 The stratum denudation statistics of the key tectonic change periods of some wells in Yubei area(m)

井名	加里东中期早幕	加里东中期Ⅰ幕	加里东中期Ⅲ幕	海西早期	海西晚期
玉北1	65.6	80.75	367	607	480
玉北5	67.3	75	354	540	450
玉北8	81.2	104.5	447	480	0
玉北9	65.0	73	346	560	465
皮山北2	74.1	93.5	439	395	0

Table 2 The palaeo water depth and the heat flow values of Markit area in Tarim Basin

地层单元	年代/Ma	古水深/m	热流值/(mW/m²)
现今	0	0	43.5
Q	2.59	100	43.7
N	23.03	120	44.5
E	65.5	30	45.3
M	251	10	46.9
P₃	260.4	10	48.5
P₂	270.6	10	50.5
P₁	299	20	51.6
C₂	318.1	30	52.2
C₁	359.2	50	54.6
S-D	443.7	30	55.2
O₃	460.9	50	60.1
O₂	471.8	30	57.8
O₁y	478.6	30	56.5
O₁p	488.3	30	56.8
∈₃	501	50	57.2
∈₁	542	30	58.6

Fig.3 The temperature of the theoretical values consistent with the measured in the key drillings,Yubei area

Fig.4 The Ro of the theoretical values consistent with the measured in the key wells,Yubei area

Fig.5 Thermal evolution and maturity evolution of 3 representative wells in the eastern Yubei area, Tarim Basin

Fig.6 Thermal evolution and maturity evolution of well Yubei 8 in the central Yubei area, Tarim Basin

Fig.7 Thermal evolution and maturity evolution of well Pishan-bei 2 in the western Yubei area, Tarim Basin

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