石油勘探与开发 >

2021 , Vol. 48 >Issue 2: 290 - 302

DOI: https://doi.org/10.11698/PED.2021.02.06

油气勘探

川中古隆起寒武系沧浪铺组下段天然气地质特征及勘探方向

  • 严威 ,
  • 罗冰 ,
  • 周刚 ,
  • 陈友莲 ,
  • 钟原 ,
  • 李堃宇 ,
  • 周红飞 ,
  • 赵立可 ,
  • 和源
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  • 中国石油西南油气田公司勘探开发研究院,成都 610041
严威（1981-）,男,四川绵阳人,博士,中国石油西南油气田公司勘探开发研究院高级工程师,主要从事震旦系—下古生界区域地质综合研究。地址：四川省成都市武侯区天府大道北段12号西南油气田科技大厦,邮政编码：610041。E-mail: yanwei-tlm123@petrochina.com.cn

收稿日期: 2020-10-16

  修回日期: 2021-03-11

  网络出版日期: 2021-03-19

基金资助

中国石油天然气股份有限公司重大科技专项“西南油气田天然气上产300亿立方米关键技术与应用”（2016E-0602）

收起

Natural gas geology and exploration direction of the Cambrian Lower Canglangpu Member in central Sichuan paleo-uplift, Sichuan Basin, SW China

  • YAN Wei ,
  • LUO Bing ,
  • ZHOU Gang ,
  • CHEN Youlian ,
  • ZHONG Yuan ,
  • LI Kunyu ,
  • ZHOU Hongfei ,
  • ZHAO Like ,
  • HE Yuan
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  • Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oilfield Company, Chengdu 610041, China

Received date: 2020-10-16

  Revised date: 2021-03-11

  Online published: 2021-03-19

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摘要

综合利用JT1、CS1等钻井资料,结合露头剖面及地震资料,研究四川盆地川中古隆起寒武系沧浪铺组下段沉积格局、生储盖空间配置及古隆起演化特征,揭示有利勘探区带。沧浪铺组下段沉积格局受德阳—安岳裂陷控制,具有东西分异的特征,裂陷西侧以碎屑沉积物为主,裂陷东侧呈现为清水陆棚环境,沿着棚内洼地边缘、陆棚边缘及膏质潟湖边缘发育了规模滩体,其中白云岩滩体主要分布在洼地边缘及潟湖北侧,受岩溶叠加改造作用可形成优质储集层。沧下段白云岩滩体下伏筇竹寺组广覆式烃源岩,可原地直接充注,上覆沧上段砂泥岩直接盖层,主力成藏期滩体位于古隆起较高部位,成藏要素配置关系较好。优选PT1—CS1井区、HT1—GT2井区、GT2东井区为沧浪铺组下段天然气勘探的有利区带。图16表2参27

关键词： 四川盆地; 川中古隆起; 寒武系; 沧浪铺组; 白云岩; 地质特征; 有利区带

本文引用格式

严威 , 罗冰 , 周刚 , 陈友莲 , 钟原 , 李堃宇 , 周红飞 , 赵立可 , 和源 . 川中古隆起寒武系沧浪铺组下段天然气地质特征及勘探方向[J]. 石油勘探与开发, 2021 , 48(2) : 290 -302 . DOI: 10.11698/PED.2021.02.06

Abstract

Based on drilling data of JT1 and CS1, outcrop profiles and seismic data, the sedimentary pattern, space configuration of source-reservoir-cap combinations and paleouplift evolution characteristics of the Cambrian Lower Canglangpu Member in the central Sichuan paleouplift have been investigated to determine the favorable exploration zones. Controlled by Deyang-Anyue rift, the Lower Canglangpu Member features differential characteristics from east to west in sedimentary framework. In the west side of the Deyang-Anyue rift, this member is composed of clastic sediments, while in the east side of the Deyang-Anyue rift, it is fresh water shelf sediments, with grain beaches occurring along edges of the depressions, shelf and lagoon. Among the beaches, the dolomitic ones are mainly distributed around the depression edge and in the north of the lagoon. The beach sediments could become high quality reservoirs under the effect of karstification. Underlying the Lower Canglangpu Member is the widespread source rock of the Qiongzhusi Formation, so oil and gas generated by the Qiongzhusi Formation source rock can directly charge into the beach reservoirs. The sandy mudstone of the Upper Canglangpu Member can serve as the caprock of the Lower Canglangpu Member reservoir. The dolomitic beaches are located at the higher part of the paleo-uplift during the main accumulation period, with good hydrocarbon accumulation elements. Blocks PT1-CS1, HT1-GT2 and east GT2 are favorable exploration zones.

Key words： Sichuan Basin; central Sichuan paleo-uplift; Cambrian; Canglangpu Formation; dolomite; geological characteristics; favorable zone

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