CN104570156A - 一种三角洲前缘相沉积地层底面等高程精度对比方法 - Google Patents

一种三角洲前缘相沉积地层底面等高程精度对比方法 Download PDF

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CN104570156A
CN104570156A CN201310518817.3A CN201310518817A CN104570156A CN 104570156 A CN104570156 A CN 104570156A CN 201310518817 A CN201310518817 A CN 201310518817A CN 104570156 A CN104570156 A CN 104570156A
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elevation
sand body
isochronous
deposition
delta
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杨宏伟
毕义泉
王延光
孟宪军
夏吉庄
吕德灵
胡心红
张玉晓
夏建
黄尚军
潘举玲
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China Petroleum and Chemical Corp
Geophysical Research Institute of Sinopec Shengli Oilfield Co
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China Petroleum and Chemical Corp
Geophysical Research Institute of Sinopec Shengli Oilfield Co
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Abstract

本发明公开了一种三角洲前缘相沉积地层底面等高程精度对比方法,包括下列步骤:在三角洲前缘相沉积地层剖面中确定若干等时面;在沉积补偿原理控制下分析单砂体底面与其最近的等时面之间的高程,高程相等的即为同一砂体或同时期沉积的砂体;进行闭合检查和平面检查。本发明能科学合理的确定单砂体级别的地层时间,划分更加准确,所对比结果更加符合地下地质情况,对油藏开发及提高采收率更具有指导意义。

Description

一种三角洲前缘相沉积地层底面等高程精度对比方法
技术领域
该技术属于地层划分对比领域,具体涉及一种三角洲前缘相沉积地层底面等高程精度对比方法。 
背景技术
地层划分对比是油藏地质研究的基础。目前,三角洲前缘相沉积地层精细对比方法主要有高分辨率层序地层学方法、旋回法和等厚法等,存在主要问题对比的尺度效应,即在砂层组级别精度都比较高,到小层级别上述方法对比结果基本相同,但到单砂体级别多解性强,不确定性增加。 
发明内容
针对现有技术的不足,本发明的目的在于提供一种三角洲前缘相沉积地层底面等高程精度对比方法。 
本发明采用的技术方案是: 
一种三角洲前缘相沉积地层底面等高程精度对比方法,包括下列步骤:
步骤一:在三角洲前缘相沉积地层剖面中确定若干等时面,具体包括:
选择湖底面为沉积等时面;
选择河口坝和席状砂沉积的底面为等时面;
步骤二:在沉积补偿原理控制下分析单砂体底面与其最近的等时面之间的高程,高程相等的即为同一砂体或同时期沉积的砂体;
步骤三:进行闭合检查和平面检查。
进一步,在遵循等高程原理确定等时面时,还要遵循单砂体本身的沉积规律对高程原理确定等时面时进行修正的步骤; 
所述单砂体本身的沉积规律是指:单砂体沉积时的冲刷切割和叠置等作用。
进一步,单砂体底面与其最近的等时面之间的高程之间的距离不超过100米,以提高对比结果的可靠性。
每种地层对比方法都有其理论基础。三角洲前缘相沉积地层精细对比的地质理论基础是:湖底面为沉积等时面,河流流出河口后水体泄带能量突然下降,沉积物直接覆盖在湖底面上,形成底平顶凸的河口坝和席状砂沉积。因此,河口坝和席状砂沉积的底面为等时面,根据沉积补偿原理,同一河口坝沉积的底面到另一等时面的高程应该是基本相等的。这就是底面等高程法对比的基本原理。本发明运用了这一基本原理,对三角洲前缘相沉积地层剖面进行分析,科学合理的确定单砂体级别的地层时间,划分更加准确,所对比结果更加符合地下地质认识,对油藏开发及提高采收率更具有指导意义。 
附图说明
图1是胜利油田樊124块区采用底面等高程法划分单砂体的示意图。 
具体实施方式
下面,结合附图和实施例对本发明做进一步说明。 
实施例1。一种三角洲前缘相沉积地层底面等高程精度对比方法,包括下列步骤: 
步骤一:在三角洲前缘相沉积地层剖面中确定若干等时面,具体包括:
选择湖底面为沉积等时面;
选择河口坝和席状砂沉积的底面为等时面;
步骤二:在沉积补偿原理控制下分析单砂体底面与其最近的等时面之间的高程,高程相等的即为同一砂体或同时期沉积的砂体;
步骤三:进行闭合检查和平面检查。
利用底面等高程法需要注意的问题: 
①利用底面等高程法进行对比是,等时面的选择要尽量靠近对比的目标层,高程越大,对比结果的可靠性越差。
②与其他定性的对比方法相比,底面等高程法是一种半定量的对比方法,因此等高程不能绝对化和定量化,在遵循等高程原理的同时,还要遵循单砂体本身的沉积规律。 
试验例1。在胜利油田樊124块区对本技术进行了应用,并得到井间地震资料解释成果的验证,准确率远高于其它现有技术的方法。如图1所示,采用本发明方法确定了等时面后,根据等高程原理,不会将单砂体1、单砂体2与单砂体3划为同一砂体或同时期沉积的砂体,划分的更加准确。采用常规方法对单砂体的连通率为100%,采用本发明所述方法后,对比结果连通率只有50%,同时连通关系变的非常复杂,地质统计规律也发生了质的变化。说明利用该技术所对比结果更加符合地下地质情况,对油藏开发及提高采收率更具有指导意义。 

Claims (3)

1.一种三角洲前缘相沉积地层底面等高程精度对比方法,其特征在于:包括下列步骤:
步骤一:在三角洲前缘相沉积地层剖面中确定若干等时面,具体包括:
选择湖底面为沉积等时面;
选择河口坝和席状砂沉积的底面为等时面;
步骤二:在沉积补偿原理控制下分析单砂体底面与其最近的等时面之间的高程,高程相等的即为同一砂体或同时期沉积的砂体;
步骤三:进行闭合检查和平面检查。
2.如权利要求1所述的一种三角洲前缘相沉积地层底面等高程精度对比方法,其特征在于:在遵循等高程原理确定等时面时,还要遵循单砂体本身的沉积规律对高程原理确定等时面时进行修正的步骤;
所述单砂体本身的沉积规律是指:单砂体沉积时的冲刷切割和叠置等作用。
3.如权利要求1所述的一种三角洲前缘相沉积地层底面等高程精度对比方法,其特征在于:单砂体底面与其最近的等时面之间的高程之间的距离不超过100米。
CN201310518817.3A 2013-10-29 2013-10-29 一种三角洲前缘相沉积地层底面等高程精度对比方法 Pending CN104570156A (zh)

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CN105370269A (zh) * 2015-05-13 2016-03-02 长江大学 一种基于压实校正等时地层界面追踪对比方法
CN106526697A (zh) * 2016-12-07 2017-03-22 中国地质大学(北京) 一种三角洲建设与破坏主要转换面识别方法
CN110609319A (zh) * 2019-08-20 2019-12-24 中国石油大学(华东) 一种利用沉积正演模拟建立时间域层序地层剖面的方法

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CN105370269A (zh) * 2015-05-13 2016-03-02 长江大学 一种基于压实校正等时地层界面追踪对比方法
CN106526697A (zh) * 2016-12-07 2017-03-22 中国地质大学(北京) 一种三角洲建设与破坏主要转换面识别方法
CN110609319A (zh) * 2019-08-20 2019-12-24 中国石油大学(华东) 一种利用沉积正演模拟建立时间域层序地层剖面的方法

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