摘要
四川盆地安岳气田位于德阳-安岳裂陷槽东台缘,已探明近1×1012m3天然气储量。前期天然气勘探开发揭示,震旦系-寒武系的德阳-安岳裂陷槽是油气富集的有利区,但对其往南延伸情况及分布一直认识不清。通过对三维地震资料和钻井资料的综合分析,发现长宁地区发育震旦系-寒武系裂陷槽,并精细刻画了该区裂陷槽的边界与空间展布。研究揭示:①长宁地区台缘带筇竹寺组具有超覆现象,而灯影组地震削截特征明显;②地震解释震旦系灯影组厚度从台缘带至槽内显著减薄,从台内至台缘带有增厚趋势;③该裂陷槽为德阳-安岳裂陷槽南延的东侧部分。结论认为,四川盆地南部长宁地区裂陷槽周缘筇竹寺组烃源岩优越、台缘带灯影组丘滩相储层发育,灯影组天然气成藏配置条件好,区内台缘带为下步重要的勘探有利区带。
For Anyue gasfield located at eastern platform margin of Deyang-Anyue rift trough, Sichuan Basin, its proved reserves are about 1×10^12 m^3. And its early exploration and development reveals that this Sinian-Cambrian rift trough is a favorable zone for hydrocarbon accumulation. However, its southward extension had not been made clearly. So, after taking full advantage of 3D seismic and drilling data, it was discovered that the Sinian-Cambrian rift trough is also developed in Changning area. Both boundary and spatial distribution of this rift trough in Changning area were characterized precisely. Results show that,(1) in platform margin of Changning area, Qiongzhusi Formation has features of overlap whereas Dengying Formation has obvious earthquake truncation;(2) seismic interpretation on Sinian Dengying Formation demonstrates a decrease in thickness from platform margin to intra-trough whereas an increase from intra-platform to platform margin;and (3) this rift trough is an eastern part of southward extension of Deyang-Anyue rift trough. In conclusion, in Changning area, southern Sichuan Basin, source rock of Qiongzhusi Formation in the periphery of the rift trough is superior, and bioherm beach facies reservoirs of Dengying Formation in platform margin are well developed, and reservoir-forming association for Dengying Formation is good, so the platform margin in this area is one favorable zone for next exploration.
作者
邱玉超
罗冰
夏茂龙
陈友莲
戴鑫
李亚丁
周红飞
和源
Qiu Yuchao;Luo Bing;Xia Maolong;Chen Youlian;Dai Xin;Li Yading;Zhou Hongfei;He Yuan(Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 640041,China)
出处
《天然气勘探与开发》
2019年第2期22-28,共7页
Natural Gas Exploration and Development
基金
中国石油天然气股份有限公司重大科技专项“西南油气田天然气上产300亿立方米关键技术研究与应用”(编号:2016E-0602)
关键词
四川盆地
长宁地区
裂陷槽
台缘带
晚震旦世
成藏配置条件
有利区带
Sichuan Basin
Changning area
Rift trough, Platform margin
Late Sinian
reservoir-forming association
Favorable zone
