还原性流体-泥岩盖层相互作用的岩石学和地球化学记录——以松辽盆地南部王府凹陷青山口组泥岩为例

doi:10.11743/ogg20170514

石油与天然气地质 ›› 2017, Vol. 38 ›› Issue (5): 952-962.doi: 10.11743/ogg20170514

还原性流体-泥岩盖层相互作用的岩石学和地球化学记录——以松辽盆地南部王府凹陷青山口组泥岩为例

明晓冉¹, 刘立¹, 宋土顺², 刘娜¹, 杨会东³, 于雷¹, 白杭改¹

1. 吉林大学地球科学学院, 吉林长春 130061;
2. 华北理工大学矿业工程学院, 河北唐山 063009;
3. 中国石油吉林油田分公司勘探开发研究院, 吉林松原 138000

收稿日期:2017-03-31 修回日期:2017-08-12 出版日期:2017-10-28 发布日期:2017-11-10
通讯作者: 刘立(1955-),男,教授、博士生导师,储层、层序地层和沉积学。E-mail:liuli0892@vip.sina.com E-mail:liuli0892@vip.sina.com
作者简介:明晓冉(1988-),男,博士研究生,沉积岩石学。E-mail:mingy1@163.com。
基金资助:
国家自然科学基金面上项目（41172091，41572082，41372133）；河北省矿业开发与安全技术重点实验室开放基金项目（2016kykf02）。

Petrologic and geochemical records of interaction between reducing fluids and mudstone caprocks:A case from the mudstone in the Qingshankou Formation of Wangfu Depression in southern Songliao Basin

Ming Xiaoran¹, Liu Li¹, Song Tushun², Liu Na¹, Yang Huidong³, Yu Lei¹, Bai Hanggai¹

1. College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China;
2. North China University of Science and Technology, Tangshan, Hebei 063009, China;
3. Research Institute of Exploration and Development, Jilin Oilfield Company, PetroChina, Songyuan, Jilin 138000, China

Received:2017-03-31 Revised:2017-08-12 Online:2017-10-28 Published:2017-11-10

摘要/Abstract

摘要： 天然气田（藏）中渗漏的还原性流体将导致泥岩盖层的成分（尤其是常量和微量元素）变化。这种变化记录了还原性流体-岩石相互作用事件，并具有指示油气藏位置的意义。利用天然类比方法，并以松辽盆地南部王府凹陷青山口组泥岩为对象，对天然气田（藏）中还原性流体引起的泥岩成分变化和流体在盖层中的运移方式进行了研究。结果表明：研究区渗漏流体的主要还原性成分为CH₄，其次为H₂S；在流体-岩石相互作用过程中，泥岩中红色的Fe³⁺被还原为无色的Fe²⁺，从而导致了漂白现象的出现。Fe²⁺以胶体的形式随流体运移至别处或以铁结核的形式重新沉淀；漂白过程中U含量的升高、Ga和Sc含量的降低，与U、Mo、V和Ni含量在纵向上的规律性变化均和流体的还原性有关；在泥岩盖层中，还原性流体主要在浮力的驱动下发生纵向运移，且地层抬升可导致其水位降低；天然气田（藏）泥岩盖层中微量元素的规律性变化具有指示还原性流体流动路径和方向的意义。

关键词: 泥岩盖层, 还原性流体, 漂白泥岩, 铁结核, 天然类比, 天然气田(藏), 松辽盆地

Abstract: Reducing fluids percolated from natural gas reservoirs or fields may cause composition variation (especially the macro and trace elements) of mudstone caprocks.The variation records the interaction between the reducing fluids and mudstone caprocks and may be used as an indicator of the locations of oil and gas reservoirs.By resorting to natural analogy,we studied the mudstone samples from the the Qingshankou Formation of Wangfu Depression in southern Songliao Basin to analyze the variation of mudstone composition caused by reducing fluids and the migration of the fluids in cap rocks of gas fields (reservoirs).The results show that the reducing components in the fluids are mainly methane,followed by hydrogen sulfide.During the fluid-rock interaction process,the red Fe³⁺ in the mudstone was reduced to colorless Fe²⁺,causing a phenomenon called bleach.The Fe²⁺ then migrated in the form of colloids with the fluids and reprecipitaed as iron concretions elsewhere.During the bleach process,the increasing U content,and decreasing Ga and Sc contents,as well as the veritical changes of the U,Mo,V and Ni contents,are suggested to be connected with the reductivity of the fluids.In mudstone caprocks,the reducing fluids were driven by buoyancy to migrate vertically and the uplifting of strata might cause dropping of fluid surface.The regular variation of trace elements in the mudstone caprocks may be used as indicators to the flow pathways and directions of the reductive fluids.

Key words: mudstone caprock, reducing fluid, bleached mudstone, iron concretion, natural analogy, natural gas field (reservoir), Songliao Basin

中图分类号:

TE122.1

明晓冉,刘立,宋土顺,等. 还原性流体-泥岩盖层相互作用的岩石学和地球化学记录——以松辽盆地南部王府凹陷青山口组泥岩为例[J]. 石油与天然气地质, 2017, 38(5): 952-962. doi: 10.11743/ogg20170514 Ming Xiaoran,Liu Li,Song Tushun,et al. Petrologic and geochemical records of interaction between reducing fluids and mudstone caprocks:A case from the mudstone in the Qingshankou Formation of Wangfu Depression in southern Songliao Basin[J]. Oil & Gas Geology, 2017, 38(5): 952-962. doi: 10.11743/ogg20170514

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还原性流体-泥岩盖层相互作用的岩石学和地球化学记录——以松辽盆地南部王府凹陷青山口组泥岩为例

Petrologic and geochemical records of interaction between reducing fluids and mudstone caprocks:A case from the mudstone in the Qingshankou Formation of Wangfu Depression in southern Songliao Basin

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