| 川西新场气田蓬莱镇组陆相地层高分辨率层序地层学研究 |
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| 引用本文： | 柳梅青,郑荣才.川西新场气田蓬莱镇组陆相地层高分辨率层序地层学研究[J].沉积学报,2000,18(1):50-56. |
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| 作者姓名： | 柳梅青 郑荣才 |
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| 作者单位： | 1.中国新星石油公司西南石油局地质综合研究院 成都 610081; |
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| 基金项目： | “油气藏地质及开发工程”国家重点实验室基金项目(编号:PLC9903) |
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| 摘 要： | 利用钻井岩芯、测井和地震资料,运用高分辨率层序地层学理论及方法,对新场地区蓬莱镇组进行不同级次的基准面旋回层序划分,识别出 45～ 47个短期、5个中期、2个长期基准面旋回层序,并对不同级次的基准面旋回层序的结构类型、叠加样式和平面分布模式进行了较为深入的讨论。在单井分析的基础上,以二分时间单元分界线为优选等时对比标志对不同级次的基准面旋回进行了较高精度的等时对比,所对比的等时成因地层单元的最高精度可达到相当准层序组 (十万年级 )的短期基准面旋回。建立了新场地区蓬莱镇组高分辨率层序地层格架,成功地将单井一维信息转化为气田范围内的三维地层关系信息。并分析了短期基准面旋回过程中可容纳空间 (A)与沉积物补给通量 (S)的比值 (A/S)变化对储集砂体的作用.文中还利用沉积动力学的地层响应过程特征分析,重点讨论了中、短期基准面旋回过程中有利储集砂体的沉积相序列、组合特征、产状类型、控制因素及其与物性的关系。指出发育于长期基准面缓慢上升或下降过程中的三角洲沉积体系,为形成储集砂体的必备背景条件,而控制沉积体系中储层时空展布和演化规律的因素则主要为中期基准面旋回。在层序地层格架中,中期基准面旋回层序界面两侧的储层其储集性最好。以此为依据,提。
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| 关 键 词： | 新场气田 蓬莱镇组 基准面旋回 高分辨率层序地层 等时对比 地层格架 |
| 收稿时间： | 1998-10-27 |
High-Resolution Sequence Stratigraphy of Terrestrial Penglaizhen Formation of Xinchang Gas Field in Western Sichuan |
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| Institution: | 1.Geological Institute of Southwest Bureau,China National Star Petroleum CO., Chengdu 610081 |
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| Abstract: | According to the data of rock cores, well loggings and seismic interpretations, three order base-level cycles are recognized from Penglaizhen Formation in Xinchang area, which consist of 45-47 short-term base-level cycles, 5 mid-term base-level cycles, 2 long-term bsae-level cycles and their structural types, stacking patterns and distributing models are deeply discussed by using high-resolution sequence stratigraphic theory and methods. On the basis of single-well analysis, higher-accuracy isochronostratigraphic correlation is done at the thrree order base-level cycles in Penglaizhen Formation, and the relative stratigraphic frameworks are built, meanwhile one-dimensional information about single-well is converted to three-dimensional information in gasfield. According to the analysis on characteristics of stratigraphic response course of sedimentary dynamics, favorable reservoir sands' sedimentary facies, association, occurrence, controls, and relationship with physical property in the course of mid-term and short-term base-level cycles are discussed. A table of the influence of the ratio of the accommodation and the sediment supply flux to the reservoir sands is also made in this paper. It clearly shows that the delta systems in the slowly ascent or descent process of the long-term base-level cycles are the necessary background for the favorable reservoir sands, and the main element of controlling the distribution in the time and space for the sedimentary system is the mid-term base-level cycles. The best reservoir sands are on the sides of the sequencesur face of the mid-term base-level cycles. So one of the important token of reservoir forecast is the sequence surface of the mid-term base-level cycles. |
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