摘要
鄂尔多斯盆地深层寒武系具有较好的天然气勘探潜力,但因勘探程度低,岩相古地理分布、烃源岩生烃潜力、储盖组合及成藏模式不清楚。为此,基于最新地震、钻井、地质露头及大量分析化验等资料,对寒武系岩相古地理格局、烃源岩生烃潜力、有利储层特征和成藏组合类型进行了系统分析,探讨了寒武系天然气的成藏模式与天然气勘探方向。寒武纪,鄂尔多斯盆地发育“三隆三洼”的古地貌格局。受其控制,盆地南部富平—洛川深水海湾内发育东坡组和徐庄组2套烃源岩,海湾内烃源岩厚度大;盆地东北部地区神木东台洼发育徐庄组烃源岩。受古隆起、台地边缘或台洼边缘控制,寒武系发育张夏组高能颗粒滩和三山子组岩溶风化壳2类有利储层。鄂尔多斯盆地寒武系存在自生自储、下生上储和上生下储3种成藏组合类型,发育深水海湾、台内洼地、台缘斜坡与古隆起周缘4种成藏模式;盆地南部富平—洛川深水海湾周缘高能颗粒滩与岩溶风化壳、盆地东北部神木东台洼边缘高能颗粒滩,以及庆阳古隆起东侧高能颗粒滩与岩溶风化壳和伊盟古陆东南侧岩溶风化壳有利区带是寒武系天然气的有利勘探方向。
The deep Cambrian in Ordos Basin has promising potential for natural gas exploration.However,due to the low degree of exploration,lithofacies paleogeographic distribution,hydrocarbon generation potential of source rocks,reservoir and cap rock combination,and hydrocarbon accumulation pattern are unclear.Based on the new seismic,well drilling,outcrops and a large number of laboratory test data,the Cambrian lithofacies paleogeographic distribution,hydrocarbon generation potential of source rocks,favorable reservoirs characteristics,and source rock–reservoir combination types are systematically analyzed,and hydrocarbon accumulation pattern and natural gas exploration orientation in the Cambrian are discussed.During the Cambrian,a paleogeomorphologic pattern of“three uplifts and three depressions”was formed in Ordos Basin.As a result,two sets of source rocks were developed in Dongpo Formation and Xuzhuang Formation in Fuping–Luochuan deep-water bay in the southern basin,with a large thickness in the deep-water bay,and Xuzhuang Formation source rock was deposited in Shenmu East intra platform depression in the northeastern basin.Controlled by paleo uplift,platform margin or platform depression margin,two types of favorable reservoirs were developed in the Cambrian,i.e.,high-energy granular beach in Zhangxia Formation and karst weathered crust in Sanshanzi Formation.Three types of source rock and reservoir combinations are classified in the Cambrian,including self-generation and self-storage type,lower source rock and upper reservoir type,and upper source rock and lower reservoir type.In addition,four hydrocarbon accumulation patterns are established for the deep-water bay,intra platform depression,platform marginal slope and peripheral paleo uplift.The favorable exploration orientations of the Cambrian natural gas reservoirs include the high-energy granular beach and karst weathered crust in the peripheral Fuping–Luochuan deep-water bay in the southern basin,high-energy granular beach in Shenmu East platform depression margin in the northeastern basin,high-energy granular beach and karst weathered crust on the east side of Qingyang paleo uplift,and karst weathered crust on the southeast side of Yimeng paleo uplift.
作者
黄军平
范立勇
张艳
任军峰
史江龙
井向辉
王宏波
李相博
冯明
王菁
Huang Junping;Fan Liyong;Zhang Yan;Ren Junfeng;Shi Jianglong;Jing Xianghui;Wang Hongbo;Li XiangBo;Feng Ming;Wang Jing(PetroChina Research Institute of Petroleum Exploration&Development-Northwest;Research Institute of Exploration&Development,PetroChina Changqing Oilfield Company)
出处
《中国石油勘探》
北大核心
2025年第1期98-110,共13页
China Petroleum Exploration
基金
中国石油天然气股份有限公司油气和新能源分公司科技项目“中国石油重点地区风险勘探目标研究”(2023YQX10101)
“鄂尔多斯盆地风险勘探领域和目标研究、工程技术攻关及现场试验”(2023YQX10105)。
关键词
鄂尔多斯盆地
寒武系
成藏模式
天然气
勘探方向
Ordos Basin
Cambrian
hydrocarbon accumulation pattern
natural gas
exploration orientation
作者简介
第一作者:黄军平(1983-),男,湖北公安人,博士,2021年毕业于长江大学,高级工程师,现主要从事海相碳酸盐岩油气综合地质研究工作。地址:甘肃省兰州市城关区雁儿湾路535号,邮政编码:730020。E-mail:huang_jp@petrochina.com.cn。
