川东地区寒武系龙王庙组沉积相特征与有利相带分布  

Sedimentary facies characteristics and favorable facies belt distribution of Cambrian Longwangmiao Formation, eastern Sichuan Basin

作　　者：张文济[1] 李世临[1] 任晓莉 张静 郭艳波[1] 叶朝阳 陈亚妮 Zhang Wenji;Li Shilin;Ren Xiaoli;Zhang Jing;Guo Yanbo;Ye Zhaoyang(Chongqing Gas Division, PetroChina Southwest Oil & Gasfield Company, Chongqing 400021,China;Sichuan Changning Natural Gas Development Company Limited, Chengdu, Sichuan 610056,China;School of Petroleum Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500,China)

机构地区：[1]中国石油西南油气田分公司重庆气矿 [2]四川长宁天然气开发有限责任公司 [3]西南石油大学石油工程学院

出　　处：《天然气勘探与开发》2019年第2期56-65,共10页Natural Gas Exploration and Development

基　　金：中国石油天然气股份有限公司西南油气田分公司重大专项“川东地区天然气勘探开发关键技术研究与应用”(编号:2016ZD01)

摘　　要：近年来,四川盆地中部地区寒武系龙王庙组勘探获得重大突破并取得了相应的地质认识,但是针对川东地区寒武系龙王庙组的勘探目前仍处于初步阶段,地质认识也相对不足。通过充分利用区内完钻井资料并结合川东及野外露头剖面,采用岩心、露头宏观描述与薄片镜下微观鉴定相结合的方法,开展岩石学特征和沉积相特征分析。表明:①川东地区寒武系龙王庙组主要发育白云岩类、石灰岩类,局部发育石膏岩类及碎屑岩类;②主要发育碳酸盐岩台地相,局限台地亚相和开阔台地亚相及其相应的沉积微相;③区块西北角曾1井一带为碎屑岩和碳酸盐混积台地相;区块中部巴中—万源—开州—万州—重庆一带为局限台地,区块东部石柱—云阳—城口至恩施—巫山—镇坪一带发育开阔台地;④在长寿—涪陵一带为蒸发台地相。城口—利川、宣汉—垫江一线颗粒滩为有利的沉积相带。该沉积相研究成果针对下一步在川东地区的天然气勘探有利区选择具有参考价值。In recent years, great breakthrough has been made in gas exploration of Cambrian Longwangmiao Formation, central Sichuan Basin, and many geological understandings have also been achieved. However, another exploration of Longwangmiao Formation in eastern basin is still in its initial stage, resulting in relatively few understandings. So, both petrological and sedimentary facies characteristics of Longwangmiao Formation in eastern basin were analyzed by core and outcrop description, thin-section identification, and drilling data. Results show that (1) the Cambrian Longwangmiao Formation, eastern Sichuan Basin, is mainly composed of dolomite and limestone, and partly gypsum and clastic rocks;(2) there are dominantly developed carbonate platform facies, restricted and open platform subfacies, and their corresponding microfacies;(3) the clastic-carbonate diamictite platform facies is distributed in northern block around Zeng 1 well, the restricted platform facies for central block around Bazhong-Wanyuan-Kaizhou-Wanzhou-Chongqing area, and the open platform facies for eastern block around Shizhu-Yunyang-Chengkou-Enshi-Wushan-Zhenping area, respectively;and (4) the evaporation platform facies is distributed in Changshou-Fuling area, and some grain beach developed in Chengkou-Lichuan and Xuanhan-Dianjiang areas is one favorable facies belt. These results on sedimentary facies may provide reference for selecting favorable areas for gas exploration in eastern Sichuan Basin.

关 键 词：川东地区 下寒武统 龙王庙组 岩石特征 沉积相 油气勘探 

分 类 号：P618.13[天文地球—矿床学]