西南石油大学学报(自然科学版) ›› 2008, Vol. 30 ›› Issue (6): 35-39.DOI: 10.3863/j.issn.1000-2634.2008.06.009

• 地质勘探 • 上一篇    下一篇

磨溪气田嘉二段沉积相再认识

罗冰1 邹娟2 唐青松3 丁熊1 黄勇斌4   

  1. 1.西南石油大学资源与环境学院,四川 成都 610500; 2.西南油气田分公司川西北气矿,四川 江油 621700;3.西南油气田分公司川中油气矿,四川 遂宁 629000; 4.西南油气田分公司蜀南气矿,四川 泸州 646001
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-12-20 发布日期:2008-12-20

RERECOGNITION OF SEDIMENTARY FACIES OF THE JIA 2 MEMBER IN MOXI GAS FIELD

LUO Bing1 ZOU Juan2 TANG Qing-song3 DING Xiong1 HUANG Yong-bin4   

  1. 1.Resource and Environment Institute,Southwest Petroleum University,Chengdu Sichuan 610500,China;2.Northwest Sichuan Gas Field,Southwest Oil and Gas Field Company,Jiangyou Sichuan 621700,China;3.Central Sichuan Oil and Gas Field,Southwest Oil and Gas Field Company,Suining Sichuan 629000,China;4.Shunan Gas Field,Southwest Oil and Gas Field Company,Luzhou Sichuan 646001,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-12-20 Published:2008-12-20

摘要: 针对川中地区下三叠统嘉陵江组二段沉积环境的判别一直存在潮坪相和非潮坪相的争论,以磨溪气田岩芯精细描述、薄片鉴定、测井曲线分析为基础,通过对嘉二段沉积古地理背景、岩石类型、沉积构造、沉积韵律、古气候及成岩演化等方面的详细分析,发现磨溪嘉二段并非大面积分布的潮坪相,而是陆表海型碳酸盐岩局限台地相-蒸发海台地相,并以潮下还原环境为主,类潮坪沉积特征仅见于嘉二2B层,可识别出台坪、粒屑滩、滩间海、半局限-局限泻湖、蒸发泻湖等亚相及其多种不同的沉积微相。嘉二1亚段主要为半局限-局限-蒸发泻湖夹风暴岩沉积,嘉二2A层以发育鲕粒滩微相为特征,嘉二2B层以台坪亚相为特色,嘉二2C层发育砂屑滩和蒸发泻湖亚相。不同微相储集性能分析表明云坪、砂屑滩和鲕粒滩微相为最有利的储集相带

关键词: 沉积相, 陆表海台地, 嘉二段, 磨溪气田, 四川盆地

Abstract:

About the sedimentary facies of the Jia 2 Member,Jialingjiang Formation,Lower Triassic in Centre Sichuan,there exists a disagreement on tidalflat

deposition and nontidalflat deposition for many years.On the basis of fine core description,thinsection identification and logging analysis,according to the

analysis of sedimentary characteristics,such as sedimentary palaeogeographic background,lithology,sedimentary structures,sedimentary rhyme,palaeoclimate and digenetic

evolution,it is realized that tidal flat facies is not widly distributed in Jia 2 Member,Moxi gas field,but the restricted to evaporate carbonate platform facies in the

epeiric sea is common,and subtidal reducing environment is dominant.The depositional characteristics of similar tidalflat environment exist in the Jia22 B bed

only.It is recognized that the sedimentary facies in Jia 2 Member mainly include platform flat,grain shoal,interbank sea,semirestricted to restricted lagoon,

evaporative lagoon subfacies and so on.The Jia 21 Submember is mainly composed of the deposition of semirestricted to restricted to evaporate lagoon and

interbedded tempestite.The Jia 22 A Bed is characterized by the development of oolitic shoal microfacies.The Jia 22 B Bed is featured by the development of platform

flat subfacies.The sandsize intraclast shoal and evaporative lagoon subfacies are developed in the Jia 22 C Bed.By the analysis of a change of reservoir

porosity with microfacies,it is shown that the dolomite flat,sandsize intraclast shoal and oolitic shoal are favorable reservoir microfacies.

Key words: sedimentary facies, epeiricsea platform, Jia 2 member, Moxi gas field, Sichuan Basin

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