川东华蓥山地区长兴组台内礁滩内部结构及发育模式

礁滩相带是碳酸盐岩油气勘探的有利沉积相带，摸清台内礁滩相带的分布和演化规律，对川东地区台地内部油气勘探具有重要意义。 在对广安华蓥山地区天池涧水沟剖面长兴组生物礁滩进行精细写实和详细研究的同时，对其礁滩内部结构特征进行了深入研究，精细刻画出礁滩内部结构和发育模式，指出礁滩体内部有利储层的分布规律。剖面上识别出了 3 期生物礁生长旋回，均由粒屑滩沉积的礁基和障积礁或骨架礁组成的礁核构成，分别对应于 3 个向上变浅的准层序组，总体构成加积-进积型生物礁，其中第 2 期生物礁最为发育。 各期生物礁生长旋回顶部的礁滩复合体白云石化作用强烈，有利于储层形成。

Internal structure and development model of intra-platform reef and shoal of Changxing Formation in Huayingshan area,eastern Sichuan

Reef and shoal facies is favorable sedimentary facies about carbonate rock oil and gas exploration. Clarifying the distribution and evolution of intra-platform reef and shoal facies is important for oil and gas exploration in intraplatform. Through a fine realistic and detailed profile study of reef of Changxing Formation in Jianshuigou section, Tianchi of Huayingshan area, this paper studied the characteristics of reef and shoal, depicted the internal structure and the development model of reef and shoal, and pointed out the distribution of favorable reservoir inside the reef. Three stages of growth cycles identified in profile are made up of reef base and baffling reef or reef skeleton deposited by grain debris beach, respectively corresponding to three upward shallowing parasequence groups, and they constituted aggradation-progradation reef. The second stage of reef is the most developed. The dolomitization of reef and shoal complex is strong in the top of growth cycle phases, and it is favorable for the reservoir formation.