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Modos de sobreposição e características evolutivas sedimentares dos recifes microbianos da quarta seção do Grupo Dengying (Sistema Siniano) na região de Gaomo da Bacia de Sichuan

  • role： First author第一作者
  • Affiliation：

    Research Institute of Petroleum Exploration & Development， PetroChina， Beijing 100083， China

  • Email：xiaqy-ordos@petrochina.com.cn
  • Introduction：夏钦禹（1991—），男，高级工程师，油气藏开发地质学。E‑mail： xiaqy-ordos@petrochina.com.cn。
XIA Qinyu1,  
  • Affiliation：

    Research Institute of Petroleum Exploration & Development， PetroChina， Beijing 100083， China

ZHANG Lin1,  
  • Affiliation：

    Exploration and Development Research Institute， Southwest Oil & Gasfield Company， PetroChina， Chengdu， Sichuan 610051， China

YANG Dongfan2,  
  • Affiliation：

    Exploration and Development Research Institute， Southwest Oil & Gasfield Company， PetroChina， Chengdu， Sichuan 610051， China

XU Wei2,  
  • Affiliation：

    Exploration and Development Research Institute， Southwest Oil & Gasfield Company， PetroChina， Chengdu， Sichuan 610051， China

LUO Wenjun2,  
  • Affiliation：

    Research Institute of Petroleum Exploration & Development， PetroChina， Beijing 100083， China

LIU Junying1,  
  • Affiliation：

    Research Institute of Petroleum Exploration & Development， PetroChina， Beijing 100083， China

GUO Zhenhua1,  
  • Affiliation：

    Research Institute of Petroleum Exploration & Development， PetroChina， Beijing 100083， China

YAN Haijun1,  
  • Affiliation：

    Exploration and Development Research Institute， Southwest Oil & Gasfield Company， PetroChina， Chengdu， Sichuan 610051， China

LAN Xuemei2,  
  • Affiliation：

    Exploration and Development Research Institute， Southwest Oil & Gasfield Company， PetroChina， Chengdu， Sichuan 610051， China

YAN Mengnan2

Resumo

Os reservatórios da quarta seção do Grupo Dengying (Grupo Dengying) do Sistema Siniano na Bacia de Sichuan são reservatórios de rochas cársticas formados pela sobreposição de recifes microbianos (abreviados como recifes) e por processos de dissolução cársica. Identificar a distribuição e as características evolutivas dos recifes é de grande importância para uma caracterização detalhada do reservatório. Utilizando amostras de núcleo, afloramentos, registros de poço e dados sísmicos 3D, foram identificados os tipos de microfacies dos recifes, resumidos os seus modos de sobreposição, analisadas as características de distribuição dos recifes em diferentes períodos, e esclarecidos os processos evolutivos sedimentares e o controle do reservatório. O estudo mostra que: ① Sob o controle da profundidade relativa da massa de água, desenvolvem-se três tipos de recifes na quarta seção do Grupo Dengying: sobreposição vertical, migração lateral e isolados. O tipo de sobreposição vertical consiste em recifes em blocos acumulados, cujos eixos sísmicos homogêneos apresentam múltiplas reflexões paralelas com amplitudes médias a fracas e continuidade média a fraca; o tipo de migração lateral consiste em recifes tabulares acumulados lateralmente ou do tipo progradante, com eixos sísmicos homogêneos em padrão de telhas sobrepostas e reflexões de amplitudes médias a fracas e continuidade média a fraca; recifes isolados apresentam forma tipo tapete, com reflexões fracas em forma de colinas nos eixos sísmicos homogêneos. ② No início da sedimentação da quarta seção do Grupo Dengying, a distribuição dos recifes era limitada, desenvolvendo-se recifes do tipo migração lateral e isolados; no estágio tardio, a distribuição passou a ser contínua, desenvolvendo os tipos sobreposição vertical, migração lateral e isolados. ③ A porosidade média dos recifes dos tipos sobreposição vertical e migração lateral é de 5,2% e 3,3% respectivamente, indicando um elevado grau de desenvolvimento de reservatórios de boa qualidade e constituindo alvos favoráveis para o desenvolvimento; os recifes isolados têm uma porosidade média de apenas 2,2%, indicando um desenvolvimento insuficiente de reservatórios de boa qualidade. As subcamadas 2 e 3 da faixa da borda da plataforma são dominadas pelos recifes do tipo sobreposição vertical, apresentando elevado potencial de desenvolvimento; no interior, predominam os recifes isolados, com baixo potencial de desenvolvimento.

Palavras-chave

modos de sobreposição; evolução sedimentar; recifes microbianos; grupo Dengying; sistema Siniano; região de Gaomo; bacia de Sichuan

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