双甜点预测的几点总结:

1、总览

“双甜点”在油气地质领域的意思是地质甜点工程甜点地质甜点是指该地区有油气藏的富集;而工程甜点则是在地质甜点的基础上,该地区的油气藏又容易压裂开发。简而言之,良好储层是基础,有效开发是关键。

地质甜点有关的地质参数:

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地质甜点
物性参数
孔隙度
渗透率
含油气性参数
含油饱和度 or 含气量
地球化学参数
TOC
流动烃

工程甜点有关参数:

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工程甜点
脆性指数
压力系数
裂缝预测

2、甜点各参数预测步骤

双甜点的预测一般依赖于测井和地震勘探两种手段。

测井可以纵向对井点的地质参数进行精细评价;而地震勘探可以对核心参数展布评价。

地震资料反演Por(孔隙度)的原理:在精细层位的标定基础上,利用测井、地震资料,采用马尔可夫链-蒙特卡洛算法随机地震反演得到波阻抗,然后使用云变换方法建立波阻抗与Por的关系,结合地质统计学协模拟对储层孔隙进行预测。

渗透率则通过测井分析得出的Por与渗透率的指数关系进行变换得到。

含油饱和度,采用相控三维地质建模,利用通过地震反演得到的岩性孔隙度渗透率建立约束模型,在此模型的约束下里利用序贯指示随机建模方法预测含油饱和度。

TOC通过叠前反演中得到的密度和剪切模量与波阻抗进行交汇而得到。

脆性指数(BI):利用测井资料只能对地层可压裂性进行纵向评价,不能得到横向展布信息;因而,需要使用叠前地震资料反演得到

经验所得BI计算公式如下:
BI=δE−δσ2BI=\frac{\delta E-\delta \sigma} {2} BI=2δE−δσ​

E为杨氏模量;σ为泊松比E为杨氏模量;\sigma为泊松比 E为杨氏模量;σ为泊松比

对于页岩来说:

Toc、Por(孔隙度)、含气性同密度线性关系好,因此,利用密度预测Toc、Por;

含气量与Toc有较好关系,因此,通过通过前面得到的Toc预测含气量

地应力压力裂缝发育则需要使用叠前方向各向异方法

3、甜点区域预测:

在获取到上述一系列参数之后,现有方法通过将各参数加权求和得到品质分数,进行分类。如下表所示:

最后呈现形式:

通过对所有甜点参数加权求和得到工区每一坐标一个品质因素Q:
Q=∑i=1nwiaiQ=\sum_{i=1}^nw_ia_i Q=i=1∑n​wi​ai​

ai为各甜点参数属性a_i为各甜点参数属性 ai​为各甜点参数属性

最后根据Q值处于不同得区间而划分不同的甜点区域。

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