激光铀铅同位素定年技术在塔里木盆地肖尔布拉克组储层孔隙演化研究中的应用

doi:10.11743/ogg20200104

Abstract

Abstract:

The Laser Ablation (LA)Multi-Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICP-MS) technique, co-developed by the CNPC Key Laboratory of Carbonate Reservoir and School of Earth and Environmental Sciences, The University of Queensland, has huge potential to overcome the difficulty in sampling and dating ultra-low concentration U-Pb minerals in ancient marine carbonates that are relatively smaller in diameter in diagenetic fabric, which was untenable by the conventional isotope dilution (ID) methods. The in-situ analysis by LA combined with MC-ICP-MS has been applied to the study on the diagenesis and porosity evolution of the Cambrian Xiaoerbulake reservoir, Tarim Basin.By dating of dolomitic and calcitic cements from filled vugs, matrix pores and fractures in different stages, we suggested that the burial diagenetic history of dolomite reservoir in the Cambrian Xiaoerblake Formation mainly features the filling of primary pores and vugs generated under karstification. The filling of vugs mainly occurred during the early Caledonian, while the filling of matrix pores mainly occurred in the middle Caledonian and Indosinian. Fractures activated during the Caledonian and Indosinian served as the channels for hydrothermal migration, providing the materials to cement the vugs and pores; while the residual vugs, pores and fractures with no filling of dolomite, calcite and siliceous cements were the main reservoir space. The diagenesis and porosity evolution history of dolomite reservoir in the Cambrian Xiaoerbulake Formation, Tarim Basin, was hence established. The understandings mentioned above are highly consistent with the tectonic-burial history and basin thermal history in the study area, which may be effective tools to date the ancient marine carbonate reservoir cements, to reconstruct diagenesis and porosity evolution history, and to evaluate effective pores before hydrocarbon migration in the ancient marine carbonates.

Key words: dolomitic and calcitic cement, in-situ LA U-Pb isotopic dating, diagenesis-porosity evolution history, carbonate reservoir, Cambrian Xiaoerbulake Formation, Tarim Basin

CLC Number:

TE122.2

Anping Hu, Anjiang Shen, Feng Liang, Jianxin Zhao, Xianying Luo, Yuexing Feng, Ting Cheng. Application of laser in-situ U-Pb dating to reconstruct the reservoir porosity evolution in the Cambrian Xiaoerbulake Formation, Tarim Basin[J]. Oil & Gas Geology, 2020, 41(1): 37-49.

Figures/Tables 10

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样品编号	样品来源	层位	样品产状	检测目的
X-30-①	肖尔布拉克西沟剖面	肖下2段	微生物白云岩围岩	地层年龄或白云石化时间
X-56-①	肖尔布拉克西沟剖面	肖上1段	微生物白云岩围岩	地层年龄或白云石化时间
X-17-②	肖尔布拉克西沟剖面	肖下1段	充填孔洞白云石	孔洞形成时间和孔洞充填的时间、期次
X-13-①	肖尔布拉克西沟剖面	肖下1段	充填孔洞方解石	孔洞形成时间和孔洞充填的时间、期次
ST2-20-②	舒探1井，埋深1 886 m	肖上1段	充填藻架孔白云石	孔隙形成时间和孔隙充填的时间、期次
X-56-②	肖尔布拉克西沟剖面	肖上1段	充填藻架孔白云石
X-55-②	肖尔布拉克西沟剖面	肖上1段	充填藻架孔白云石
X-30-③	肖尔布拉克西沟剖面	肖下2段	充填裂缝方解石	裂缝形成时间及期次
X-28-②	肖尔布拉克西沟剖面	肖下2段	充填裂缝方解石
D₁-49-②	肖尔布拉克东1沟剖面	肖上1段	充填裂缝白云石
X-35-②	肖尔布拉克西沟剖面	肖下3段	充填裂缝白云石
X-35-③	肖尔布拉克西沟剖面	肖下3段	充填裂缝白云石

样品编号	样品产状	同位素年龄/Ma	阴极发光	地球化学特征
样品编号	样品产状	同位素年龄/Ma	阴极发光	Δ₄₇或包裹体均一温度/℃	δ¹³C(PDB)/‰	δ¹⁸O(PDB)/‰
X-30-①	围岩	491.6±9.2	不发光	—	0~2	-2~-4
X-56-①	围岩	488±24	昏暗发光	—	0~2	0~-3
X-17-②	充填孔洞白云石	476±13	橙黄色明亮发光	149.3	-1~3	-6~-12
X-13-①	充填孔洞方解石	486±23	橙黄色中等发光	225	-2~2	-9~-17
ST2-20-②	充填藻架孔白云石	235.9±4.0	橙黄色明亮发光	205	—	—
X-56-②	充填藻架孔白云石	458±12	橙黄色中等发光	—	—	—
X-55-②	充填藻架孔白云石	457±17	橙黄色中等发光	—	—	—
X-30-③	充填裂缝方解石	204±37	亮黄色明亮发光	141.5	-1~2	-7~-14
X-28-②	充填裂缝方解石	471±10	亮黄色明亮发光	137.5	-2~2	-8~-15
D₁-49-②	充填裂缝白云石	450±15	橙黄色明亮发光	135	-2~2	-7~-12
X-35-②	充填裂缝白云石	227.0±4.5	橙黄色中等/明亮发光	—	—	—
X-35-③	充填裂缝白云石	14±13	橙黄色中等/明亮发光	—	—	—

样品编号	样品产状	¹⁷⁶Lu/10^-6	¹⁷⁸Hf/10^-6	²⁰⁶Pb/10^-6	²⁰⁷Pb/10^-6	²⁰⁸Pb/10^-6	²³⁸U/10^-6	Sr同位素
X-30-①	围岩	0.011 67	0.005 1	0.690	0.310 0	0.330 0	1.220 0	0.708 673
X-56-①	围岩	0.034 20	0.048 0	3.230	2.180 0	2.210 0	2.860 0	0.708 922
X-17-②	充填孔洞白云石	0.007 06	0.000 9	0.275	0.221 0	0.219 0	0.153 3	0.709 756
X-13-①	充填孔洞方解石	0.010 09	0	0.205	0.022 1	0.009 1	0.644 0	0.708 808
ST2-20-②	充填藻架孔白云石	0.008 10	0	0.164	0.136 0	0.154 0	0.225 0	0.709 809
X-56-②	充填藻架孔白云石	0.009 40	0.001 3	0.177	0.162 0	0.176 0	0.267 0	0.709 106
X-55-②	充填藻架孔白云石	0.020 40	0	1.010	0.980 0	0.950 0	0.125 0	—
X-30-③	充填裂缝方解石	0.018 90	0.001 1	3.090	2.980 0	3.060 0	0.014 0	0.709 386
X-28-②	充填裂缝方解石	0.007 85	0.006 0	2.210	2.150 0	2.210 0	0.042 0	0.709 308
D₁-49-②	充填裂缝白云石	0.043 90	0.000 6	0.094	0.082 0	0.093 0	0.025 6	0.709 357
X-35-②	充填裂缝白云石	0.017 50	0	0.211	0.176 0	0.171 0	0.035 0	—
X-35-③	充填裂缝白云石	0.045 50	0	0.279	0.250 0	0.249 0	0.026 0	—

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Application of laser in-situ U-Pb dating to reconstruct the reservoir porosity evolution in the Cambrian Xiaoerbulake Formation, Tarim Basin

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