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四川盆地震旦系灯影组层序划分及多期台缘带的发现
Sequence classification and discovery of multi-stage platform margin belts of Sinian Dengying Formation, Sichuan Basin
王文之1 文 龙1 姚 军2 李堃宇1 和 源1 周红飞1 聂 晶1 李 亚1
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DOI:
作者单位:1. 中国石油西南油气田分公司勘探开发研究院 2. 中国石油勘探开发研究院西北分院
中文关键字:四川盆地 高磨地区 晚震旦世 层序 多期台缘带 隐蔽相带
英文关键字:SichuanBasin; Gaoshiti-Moxi area; Late Sinian; Sequence, Multi-stage platform margin belt; Subtle facies belt
中文摘要:    川中高磨地区灯影组台缘带勘探成效显著,但台内钻探以中—低产为主,亟待攻关有利区带预测办法。以野外露头、岩心、测井和地震资料为研究基础,利用测井数据建立灯影组可容纳空间模型,可间接反映古海平面升降规律,并以此作为地震层序划分的主要依据,建立高分辨率层序地层格架,分析沉积横向上的沉积趋势,发现台内“隐蔽”的有利相带。结果表明:①灯影组发育2 个二级层序,4 个三级层序;②首次发现灯二期及灯四期内各发育1 次区域性海退,即灯影期共有4 次区域性海退,而非前期认为的2 次海退;③ 4 期海退在高磨地区形成了4 期台缘带。结论认为:由于新发现的灯二早期及灯四早期台缘带尚未有钻探证实,台内多期台缘带应是下一步风险勘探的重要方向。
英文摘要:    Remarkable exploration achievements have been made in the platform margin belt of Dengying Formation, Gaoshiti-Moxi area, central Sichuan Basin. But, only low to medium yield was obtained after drilling practice inside the platform. It's in urgent to develop some methods to forecast favorable zones. So, based on field outcrop, an accommodation model of Dengying Formation was established using many well logging, core, and seismic data. This model can indirectly reflect change laws of ancient sea level. Then, taking it as the primary basis to classify seismic sequence, a high-resolution sequence stratigraphic framework was set up to analyze lateral sedimentary trend, so as to find out some "subtle" favorable facies belts within the platform. Results show that (1) there are two second-order and four third-order sequences in Dengying Formation; (2) it's for the first time discovered one regional regression developed in the first and the fourth members of Dengying Formation, respectively, implying that there are totally four regional regressions in this formation while it was previously deemed that there were two regressions; and (3) four platform margin belts are formed by four regressions in Gaoshiti-Moxi area. In conclusion, the newly discovered platform margin belts in the lower section of the second and fourth Dengying members have not been confirmed by drilling, so the multi-stage platform margin belts inside the platform should be an important direction for next
risk exploration.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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