黔南坳陷安顺1井泥盆系生物礁滩溶孔溶洞型白云岩发育机制  

Development Mechanism of Devonian Reef-Shoal Facies Dolostone in Well AS-1 in Qiannan Depression

作　　者：王强[1] 罗彦萍[1] 

机构地区：[1]中国石化勘探分公司研究院

出　　处：《海相油气地质》2014年第4期73-77,共5页Marine Origin Petroleum Geology

基　　金：国家科技重大专项"大型油气田及煤层气开发"之"海相碳酸盐岩大中型油气田分布规律及勘探评价"专题(编号:2011ZX05005-003-006)资助

摘　　要：黔南坳陷安顺1井在中泥盆统独山组钻遇了600多米厚的层孔虫礁滩溶孔溶洞型白云岩。该套储层的发育主要受控于高能沉积环境、海平面升降变化及后期深埋热液作用。溶孔溶洞主要是准同生期海平面频繁进退、局部暴露与淡水淋滤溶蚀作用以及后期深埋热液白云石化作用叠加的结果。白云岩主要为深埋热液白云石化作用的结果,鞍状白云石、斑马状构造、次生颗粒状黄铁矿以及白云石碳氧同位素明显偏离背景值等均是热液作用的证据。独山组白云岩的这种独特发育机制,对预测本区生物礁滩良好储层发育带具有一定的启示意义。A set of Middle Devonian Dushan reef-shoal facies dolostone reservoir that is more than 600m thick and full of karst pores and caves is drilled in Well AS-1 in Qiannan Depression, Guizhou province. It is shown that the development of the Dushan reservoir is controlled by high-energy sedimentary environment, sea-level changes and late deep-buried hydrothermalism. Abundant dissolved pores and caves formed in the reservoir because of keeping subjection in frequent geological processes involving penecontemporaneous sea level eustasies, local exposures, fresh water leaching and late deep-buried hydrothermal dolomitization. The evidences that the dolostone forms from deep- buried hydrothermal dolomitization are the hydrothermal products, such as saddle dolomite, zebra texture and secondary granular pyrite, and the fact that the values of oxygen isotope obviously deviate from the background value. This unique mechanism of Dushan dolostone is significant to predict where the development zones of the reef-shoal facies reservoir are.

关 键 词：黔南坳陷 生物礁滩相 白云岩储层 白云石化作用 

分 类 号：TE122.221[石油与天然气工程—油气勘探]