塔里木盆地蓬莱坝组层状白云岩储层发育规律
Development and Exploration Direction of Bedded Massive Dolomite Reservoir of Lower Ordovician Penglaiba Formation in Tarim Basin
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塔里木盆地蓬莱坝组油气勘探潜力巨大,但勘探对象上存在“断溶体”和层状白云岩的争议.在露头与钻井储层特征认识的基础上,岩石学与碳氧锶同位素和激光U-Pb定年等地球化学分析相结合,探讨了蓬莱坝组白云岩的成因机制及层状规模储层发育潜力与发育规律,进而根据白云岩储层分布预测讨论了塔里木盆地蓬莱坝组的勘探方向. 取得3点认识:(1)蓬莱坝组发育孔隙-孔洞型白云岩储层,平均孔隙度2.81%,最高可达13.91%,具备发育优质储层的潜力;(2)白云岩储层以准同生白云岩叠加浅埋藏云化作用形成的埋藏白云岩为主,具有相控性和规模性,可层状发育,主要分布于内缓坡-中缓坡准同生云化滩;(3)塔北南缘和塔中北斜坡为层状规模优质白云岩储层发育有利区,是该领域值得探索的勘探方向.
白云岩 / 埋藏白云石化 / 规模储层 / 蓬莱坝组 / 塔里木盆地 / 石油地质
dolomite / burial dolomitization / massive reservoir / Penglaiba Formation / Tarim Basin / petroleum geology
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中国石油基础性前瞻性科技项目“海相碳酸盐岩有效储层形成与保持机理及分布预测研究”(2021DJ0503)
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