本文選題：紫頁井 + 威寧組��； 參考：《中國巖溶》2017年03期

【摘要】：貴州南部紫云地區(qū)的威寧組以臺地邊緣藻丘沉積為主要特征。紫頁1井鉆孔巖芯顯示:威寧組總體由臺地邊緣礁(丘)向局限臺地、開闊臺地過渡的海退進(jìn)積層序,其間包括臺地邊緣藻(丘)、局限臺地、開闊臺地三個亞相,發(fā)育生物粘結(jié)巖(SMF7)、有骨屑顆粒的生屑灰泥質(zhì)顆粒石灰?guī)r/顆粒質(zhì)灰泥石灰?guī)r(SMF10)、核形石礫屑碳酸鹽巖/顆�；�?guī)r(SMF13)、集合顆�；�?guī)r微相(SMF17)、均質(zhì)無生物泥晶灰?guī)r微相(SMF23)、巖屑漂浮巖/礫屑碳酸鹽巖/角礫巖微相(SMF24)六個微相;威寧組的沉積充填序列由六個巖性組合基本相同、沉積環(huán)境、沉積微相特征大致相似的沉積旋回構(gòu)成。每一個沉積旋回均以臺地邊緣礁(丘)相的藻凝塊灰?guī)r為主體,向上則漸變?yōu)榫窒夼_地、開闊臺地相的生物碎屑灰?guī)r,表明威寧組至少經(jīng)歷了六次海平面升降變化過程;威寧組的出現(xiàn)代表了羅甸—水城北西向槽盆邊緣斜坡相的打屋壩組富有機(jī)質(zhì)泥頁巖的終結(jié)。
[Abstract]:The Weining formation in Ziyun area of southern Guizhou is characterized by algae-dune deposition on the platform margin. The core of the borehole in well Ziping1 shows that the Weining formation generally transits from the terrace edge reef (mound) to the restricted platform, and the open platform transits from the sea back to the accumulation sequence, which includes the terrace marginal algae (mound), the restricted platform, the open platform three subfacies, Biologically bonded rock (SMF7), metamorphic marlite / granular marl limestone (SMF10), carbonatite / granular limestone (SMF13), aggregate granular limestone microfacies (SMF17), homogenous actinite microfacies (SMF23), bioclastic granulite (SMF10), metamorphic conglomerate carbonate / granular limestone (SMF13), and homogenous actinite microfacies (SMF23). Lithic floating rock / gravel carbonate / breccia microfacies (SMF24) six microfacies; The sedimentary filling sequence of the Weining formation is composed of six lithologic assemblages, similar sedimentary environment and similar sedimentary microfacies characteristics. Each sedimentary cycle is dominated by algal agglomerate limestone in the reef (hilly) facies of the platform margin, and gradually changed into the bioclastic limestone of the limited platform and open platform facies, indicating that the Weining formation has experienced at least six sea level rise and fall processes. The appearance of Weining formation represents the end of organic matter-rich shale of Dawuba formation with the slope facies of Luodian-Shuicheng NW trench basin margin.
【作者單位】： 貴州省地質(zhì)調(diào)查院;中國地質(zhì)科學(xué)院巖溶地質(zhì)研究所;
【基金】：中國地質(zhì)調(diào)查局油氣資源調(diào)查中心《南方地區(qū)1∶5萬頁巖氣基礎(chǔ)地質(zhì)調(diào)查》子項目《貴州晴隆地區(qū)1∶5萬頁巖氣地質(zhì)調(diào)查》(12120115102001) 西南巖溶區(qū)1∶5萬地質(zhì)填圖試點項目(DD20160061)
【分類號】：P512.2;P618.13

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