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

石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (1): 37-49.doi: 10.11743/ogg20200104

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

胡安平^1,²(), 沈安江^1,^2,*(), 梁峰^1,², 赵建新³, 罗宪婴^1,², 俸月星³, 程婷^3,⁴

1. 中国石油杭州地质研究院, 江苏杭州 310023
2. 中国石油天然气集团公司碳酸盐岩储层重点实验室, 江苏杭州 310023
3. 昆士兰大学地球与环境科学学院放射性同位素实验室, 澳大利亚布里斯班; QLD 4072
4. 中国地质科学院北京离子探针中心, 北京 102206

收稿日期:2019-07-28 出版日期:2020-02-01 发布日期:2020-01-19
通讯作者: 沈安江 E-mail:huap_hz@petrochina.com.cn;shenaj_hz@petrochina.com.cn
第一作者简介:胡安平(1982-),女,博士,高级工程师,碳酸盐岩储层研究与地球化学实验技术研发。E-mail:huap_hz@petrochina.com.cn
基金项目:
国家科技重大专项(2016ZX05004-002);中国石油科技重大专项(2018A-0103);中国石油天然气股份有限公司直属院所基础研究和战略储备技术研究基金项目(2018D-5008-03)

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

Anping Hu^1,²(), Anjiang Shen^1,^2,*(), Feng Liang^1,², Jianxin Zhao³, Xianying Luo^1,², Yuexing Feng³, Ting Cheng^3,⁴

1. Hangzhou Research Institute of Geology, PetroChina, Hangzhou, Jiangsu 310023, China
2. Key Laboratory of Carbonate Reservoirs, CNPC, Hangzhou, Jiangsu 310023, China
3. Radiogenic Isotope Facility, School of Earth and Environmental Sciences, The University of Queensland, Brisbane QLD 4072, Australia
4. Beijing SHRIMP Center, Chinese Academy of Geological Sciences(CAGS), Beijing 102206, China

Received:2019-07-28 Online:2020-02-01 Published:2020-01-19
Contact: Anjiang Shen E-mail:huap_hz@petrochina.com.cn;shenaj_hz@petrochina.com.cn
Supported by:
国家科技重大专项(2016ZX05004-002);中国石油科技重大专项(2018A-0103);中国石油天然气股份有限公司直属院所基础研究和战略储备技术研究基金项目(2018D-5008-03)

摘要/Abstract

摘要：

古老海相碳酸盐岩铀和铅含量普遍较低、且成岩组构直径小，很难取得足够的粉末样品，常规的溶液法铀铅同位素定年在古老海相碳酸盐岩中难以推广应用。针对以上问题，中国石油集团碳酸盐岩储层重点实验室和昆士兰大学（UQ）地球科学院放射性同位素实验室两家共同开发激光原位U-Pb同位素定年技术，并应用于塔里木盆地寒武系肖尔布拉克组储层成岩-孔隙演化研究。通过充填孔洞、孔隙和裂缝中不同期次白云石和方解石胶结物的测年，指出寒武系肖尔布拉克组白云岩储层的埋藏成岩过程是孔隙和孔洞逐渐被充填的过程。孔洞的充填作用主要发生在早加里东期，孔隙的充填作用主要发生在中加里东期和印支期，加里东和印支期断裂作为热液运移的通道，为充填孔洞和孔隙的胶结物提供了物源，未被白云石、方解石和硅质胶结物充填的残留孔洞、孔隙和裂缝构成了主要储集空间，建立了肖尔布拉克组白云岩储层的成岩-孔隙演化史。这些认识与该地区的构造-埋藏史、盆地热史具有很高的吻合度，结合下古生界烃源生烃史，为古老海相胶结物形成时间确定、成岩-孔隙演化研究和油气运移前有效孔隙评价提供了利器。

关键词: 白云石和方解石胶结物, 激光原位铀铅同位素定年技术, 成岩-孔隙演化史, 碳酸盐岩储层, 寒武系肖尔布拉克组, 塔里木盆地

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

中图分类号:

TE122.2

胡安平,沈安江,梁峰,等. 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[J]. 石油与天然气地质, 2020, 41(1): 37-49. doi: 10.11743/ogg20200104 Anping Hu,Anjiang Shen,Feng Liang,et al. 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. doi: 10.11743/ogg20200104

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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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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

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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