塔里木盆地巴麦地区石炭系卡拉沙依组年代标尺及地层剥蚀厚度精细计算

doi:10.11743/ogg20230420

Abstract

Abstract:

Restoration of paleogeomorphology plays a very important role in guiding the search for high-quality reservoirs and dominant source rocks of oil and gas， during which the calculation of denudation thickness is the vital step. In this study， the abundant GR curves together with the main frequency and astronomical time scale of the Carboniferous Kalashayi Formation in the Bamai area， Tarim Basin， were used to establish the “floating” astronomical chronological scale with relative time concept and high-precision stratigraphic sequence frame using spectral analysis， wavelet transform and EMD. The results show that a complete Milankovich cycle presents in the formation as a result of astronomical orbit control during the deposition of the formation； and the astronomical chronological scale and the stratigraphic sequence frame is based on the understanding that the imf₃ component calculated by EMD method is basically consistent with the number of stratigraphic cycles under the control of e₁. Based on the results of EMD method， the relationship between the number of missing cycles and the average cycle thickness revealed by drilling in different regions was used to accurately calculate the denudation thickness of the Carboniferous Kalashayi Formation. The erosion thickness of the Kalashayi Formation of the Carboniferous in the study area varies between 0 and 390 m with the overall denudation characterized by “intensive in the west and mild in the east”. The slope area near the BT5 well in the middle of the study area is suggested to be a potential exploration target for oil and gas. The ideas and methods proposed provide a reference for the construction of high-frequency stratigraphic sequence framework， the establishment of “floating” astronomical chronological scales， and the precise calculation of formation erosion thickness in not only the study area， but also areas with similar geological settings.

Key words: continuous wavelet transform, spectral analysis, Milankovitch cycle, "floating" astronomical time scale, sequence stratigraphic, Kalashayi Formation, Baimai area, Tarim Basin

CLC Number:

TE121.3

Tan ZHANG, Wei YAO, Yongqiang ZHAO, Yushuang ZHOU, Jiwen HUANG, Xinyu FAN, Yu LUO. Time scale and denudation thickness calculation of Carboniferous Kalashayi Formation in the Bamai area， Tarim Basin[J]. Oil & Gas Geology, 2023, 44(4): 1054-1066.

Figures/Tables 13

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参数		理论周期/kyr	周期比值
偏心率	e₁	405.00	23.657	19.912	12.169	9.785	4.263	3.240
	e₂	125.00	7.301	6.146	3.756	3.020	1.316	1
	e₃	95.00	5.549	4.671	2.855	2.295	1
斜率	o₁	41.39	2.418	2.035	1.244	1
斜率	o₂	33.28	1.944	1.636	1
岁差	σ₁	20.34	1.188	1
岁差	σ₂	17.12	1

井名	旋回参数	主导频率/（1/m）	主导周期比值	天文旋回周期比值	单个旋回厚度/m	误差率/%
YB1	e₁	0.019 5	12.03	12.17	6.410	1.17
	e₂	0.062 5	3.75	3.76	2.000	0.10
	e₃	0.082 0	2.86	2.85	1.524	0.19
	o₁	0.191 4	1.23	1.24	0.653	1.48
	o₂	0.234 4	1	1	0.533	0.05
YB8	e₁	0.019 5	11.43	12.17	6.410	6.11
	e₂	0.062 1	3.59	3.76	2.013	4.47
	e₃	0.074 2	3.00	2.85	1.685	5.20
	o₁	0.191 4	1.16	1.24	0.653	6.40
	o₂	0.222 7	1	1	0.561	0.05
HT1	e₁	0.021 5	12.17	12.17	5.814	0
	e₂	0.068 3	3.83	3.76	1.830	1.86
	e₃	0.093 8	2.79	2.85	1.333	2.26
	o₁	0.209 0	1.25	1.24	0.598	0.68
	o₂	0.261 7	1	1	0.478	0.00
H3	e₁	0.021 5	12.27	12.17	5.814	0.79
	e₂	0.068 4	3.86	3.76	1.827	2.65
	e₃	0.091 8	2.87	2.85	1.362	0.63
	o₁	0.207 0	1.27	1.24	0.604	2.44
	o₂	0.263 7	1	1	0.474	0

井名	地层厚度/m	旋回数/个
井名	地层厚度/m	长偏心率（e₁）	中偏心率（e₂）	短偏心率（e₃）	长斜率（o₁）	短斜率（o₂）	imf₃
YB1	284.00	44	142	186	435	533	45
YB8	212.00	33	105	126	325	378	35
HT1	392.88	68	215	295	657	822	66
H3	397.00	68	217	291	657	828	67

井名	厚度/m	长偏心率（e₁）旋回数/个	平均旋回厚度/m	缺失旋回数/个	剥蚀厚度/m
YB1	284.00	44.00	6.45	24.00	154.80
YB4	306.10	60.00	5.10	8.00	40.81
YB8	212.00	35.00	6.05	33.00	199.65
YB9	255.88	38.00	6.73	30.00	202.01
YB10	267.88	42.00	6.38	26.00	165.83
LN1	305.00	60.00	5.08	8.00	40.67
PSB2	262.00	44.00	5.95	24.00	142.91
BT4	55.00	9.00	6.11	59.00	360.56
BT5	204.00	33.00	6.18	35.00	216.36
BT6	66.00	11.00	6.00	57.00	342.00
BK8	24.00	4.00	6.00	64.00	384.00
Q5	284.00	42.00	6.76	26.00	175.81
J2	90.00	15.00	6.00	53.00	318.00
H2	379.00	64.00	5.92	4.00	23.69
H3	397.00	67.00	5.93	1.00	5.93
H4	216.00	35.00	6.17	33.00	203.66
HT1	393.00	66.00	5.95	2.00	11.91
BD4	351.00	58.00	6.05	10.00	60.52
K1	43.00	7.00	6.14	61.00	374.71
K2	117.00	20.00	5.85	48.00	280.80

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Time scale and denudation thickness calculation of Carboniferous Kalashayi Formation in the Bamai area， Tarim Basin

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