川南地区龙马溪组元素地球化学特征及有机质富集主控因素

doi:10.12108/yxyqc.20190408

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (4): 72–84.doi: 10.12108/yxyqc.20190408

川南地区龙马溪组元素地球化学特征及有机质富集主控因素

高乔^1,2, 王兴志^1,2, 朱逸青^1,2, 赵圣贤^3,4, 张芮³, 肖哲宇⁵

1. 油气藏地质及开发工程国家重点实验室, 成都 610500;
2. 西南石油大学地球科学与技术学院, 成都 610500;
3. 中国石油西南油气田公司勘探开发研究院, 成都 610051;
4. 页岩气评价与开采四川省重点实验室, 成都 610051;
5. 自然资源部第三海洋研究所, 福建厦门 361000

收稿日期:2018-12-04 修回日期:2019-03-04 出版日期:2019-07-21 发布日期:2019-06-21
第一作者:高乔(1995-),男,西南石油大学在读硕士研究生,研究方向为沉积学与储层地质学。地址:(610500)四川省成都市新都区新都大道8号西南石油大学地球科学与技术学院。Email:953732668@qq.com。
通信作者: 王兴志(1964-),男,博士,教授,博士生导师,主要从事储层与沉积学等方面的教学与研究工作。Email:wxzswpi@163.com。
基金资助:
四川省科技支撑项目"四川盆地下古生界页岩气资源潜力评价及选区"（编号：2015SZ0001-3）资助

Elemental geochemical characteristics and main controlling factors of organic matter enrichment of Longmaxi Formation in southern Sichuan

GAO Qiao^1,2, WANG Xingzhi^1,2, ZHU Yiqing^1,2, ZHAO Shengxian^3,4, ZHANG Rui³, XIAO Zheyu⁵

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China;
2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
3. Research Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu 610051, China;
4. Key Laboratory of Shale Gas Evaluation and Exploitation of Sichuan Province, Chengdu 610051, China;
5. Third Institute of Oceanography, State Oceanic Administration, Xiamen 361000, Fujian, China

Received:2018-12-04 Revised:2019-03-04 Online:2019-07-21 Published:2019-06-21

摘要/Abstract

摘要： 为了研究川南威远-长宁地区龙马溪组古氧化还原条件及有机质富集主控因素，对4口取心井开展了主、微量元素分析。结果表明：①威远-长宁地区龙马溪组龙一1亚段整体富集V、Ni、Ba、Th和U等元素，亏损Cr元素；龙一₂亚段整体富集V、Ba、Th和U等元素，亏损Co和Cr元素。②龙一₁亚段沉积初期，研究区为缺氧环境，至中晚期，威远地区演变为贫氧或含氧环境，长宁地区演变为含氧环境。③龙一₂亚段沉积时期，威远地区WD204 H井区为稳定的含氧环境，WD201井区仍为贫氧或偶含氧环境，而长宁地区整体处于稳定的含氧环境。④龙一₁亚段有机质的富集主要受古氧化还原条件控制，龙一₂亚段有机质的富集主要受古生产力强弱控制。该研究成果对川南地区龙马溪组的页岩气勘探具有重要参考价值。

关键词: 氧化还原条件, 沉积环境, 微量元素, 有机质富集, 古生产力, 龙马溪组, 川南地区

Abstract: In order to clarify the paleoredox conditions and the main controlling factors of organic matter enrichment of Longmaxi Formation in Weiyuan-Changing areas,southern Sichuan,the analysis of major and trace elements in four coring wells was carried out. The results show that:(1)Long 1₁ sub-member of Longmaxi Formation is rich in elements of V,Ni,Ba,Th and U with the loss of Cr element,while the Long 1₂ sub-member is rich in elements of V,Ba,Th and U with the loss of Cr and Co elements.(2)In the early sedimentary stage of Long 1₁ sub-member,the study area was in anoxic environment,and in the middle and late sedimentary stages, the redox condition evolved into dysoxic or oxic in Weiyuan area,while the environment evolved into oxic in Changning area.(3)In the sedimentary stage of Long 1₂ sub-member,WD204 H well area was steadily in oxic condition and WD201 well area was still in dysoxic or partially oxic condition in Weiyuan area,while the condition was entirely oxic in Changning area.(4)The enrichment of organic matter was mainly controlled by paleoredox condition in Long 1₁ sub-member,while it was controlled by the strength of paleoproductivity in Long 1₂ sub-member. The research results have important reference value for shale gas exploration of Longmaxi Formation in southern Sichuan.

Key words: redox conditions, sedimentary environment, trace elements, organic matter enrichment, paleoproductivity, Longmaxi Formation, southern Sichuan

中图分类号:

TE132.2

高乔, 王兴志, 朱逸青, 赵圣贤, 张芮, 肖哲宇. 川南地区龙马溪组元素地球化学特征及有机质富集主控因素[J]. 岩性油气藏, 2019, 31(4): 72–84.

GAO Qiao, WANG Xingzhi, ZHU Yiqing, ZHAO Shengxian, ZHANG Rui, XIAO Zheyu. Elemental geochemical characteristics and main controlling factors of organic matter enrichment of Longmaxi Formation in southern Sichuan[J]. Lithologic Reservoirs, 2019, 31(4): 72–84.

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川南地区龙马溪组元素地球化学特征及有机质富集主控因素

Elemental geochemical characteristics and main controlling factors of organic matter enrichment of Longmaxi Formation in southern Sichuan

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