超深层致密砂岩储层构造裂缝定量表征与分布预测——以塔里木盆地库车坳陷克深5气藏为例

综合采用岩芯及薄片观察、岩芯CT扫描及成像测井解释等方法,对塔里木盆地库车坳陷克深5气藏的构造裂缝进行了定量表征,在此基础上分析了构造裂缝的成因与有效性,并基于构造应力场数值模拟法对构造裂缝的空间分布规律进行了预测。结果表明：克深5气藏的构造裂缝以高角度和直立裂缝为主,岩芯裂缝开度为0-0.4mm,多被方解石充填,微观裂缝包括矿物颗粒的穿粒缝和破裂纹,开度为20-30μm;单井纵向上具有构造裂缝密集发育段和不发育段相间分布的特征;克深5气藏主要发育白垩纪、古近纪和新近纪—第四纪3期构造裂缝,其中第3期构造裂缝是克深5区块工业规模气藏形成的关键因素之一;古构造应力场决定了构造裂缝的组系特征和数量...

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Published in地球科学与环境学报 Vol. 39; no. 5; pp. 652 - 668
Main Author 王珂 张惠良 张荣虎 王俊鹏 孙雄伟 杨学君
Format Journal Article
LanguageChinese
Published 中国石油塔里木油田公司,新疆库尔勒841000 2017
中国石油杭州地质研究院,浙江杭州 310023%中国石油杭州地质研究院,浙江杭州,310023%中国石油塔里木油田公司,新疆库尔勒,841000
中国石油勘探开发研究院,北京100083
Subjects
分布预测
塔里木盆地
定量表征
库车坳陷
构造应力场
构造裂缝
致密砂岩
超深层
ultra-deep
致密砂岩
Tarim Basin
distribution prediction
构造裂缝
structural fracture
tectonic stress field
Kuqa depression
库车坳陷
定量表征
超深层
塔里木盆地
分布预测
构造应力场
tight sandstone
quantitative characterization
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ISSN1672-6561

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Summary:综合采用岩芯及薄片观察、岩芯CT扫描及成像测井解释等方法,对塔里木盆地库车坳陷克深5气藏的构造裂缝进行了定量表征,在此基础上分析了构造裂缝的成因与有效性,并基于构造应力场数值模拟法对构造裂缝的空间分布规律进行了预测。结果表明：克深5气藏的构造裂缝以高角度和直立裂缝为主,岩芯裂缝开度为0-0.4mm,多被方解石充填,微观裂缝包括矿物颗粒的穿粒缝和破裂纹,开度为20-30μm;单井纵向上具有构造裂缝密集发育段和不发育段相间分布的特征;克深5气藏主要发育白垩纪、古近纪和新近纪—第四纪3期构造裂缝,其中第3期构造裂缝是克深5区块工业规模气藏形成的关键因素之一;古构造应力场决定了构造裂缝的组系特征和数量,沿边界断层的左旋剪切应力造成了构造应力方位和构造裂缝走向由背斜西南部的近EW向过渡为东北部的近SN向;现今构造应力场不产生新的构造裂缝,但会降低先存裂缝的有效性;背斜高部位的构造裂缝线密度较低,但开度、孔隙度和渗透率等较高,单井平均天然气产能相应也较高,纵向上随深度增加,构造裂缝线密度增大而有效开度减小;不整合面对构造裂缝有效性的控制作用主要局限在距不整合面约为70m的范围内。
Bibliography:Combined with core and thin section observation, CT scan,image logging interpretation,the characteristics of structural fracture of Keshen5 gas pool in Kuqa depression of Tarim Basin were quantitatively characterized;the origin and validity of structural fracture were analyzed;and the spatial distribution regularity of structural fracture was predicted by numerical simulation of tectonic stress field.The results show that the structural fractures of Keshen5 gas pool are mostly high dip angle or upright ones and highly filled by calcite,in which the aperturesdistribute at 0-0.4mm;microscopic fractures,in which the apertures mostly distribute at 20-30μm,include grain-crossed fracture and mineral grain crack;in vertical,intensively developed sections and undeveloped sections of structural facture have the regularity of interphase distribution;there are three periods of structural fractures formed in Cretaceous,Paleogene and Neogene-Quarternary,respectively,in which the 3rd period of structural fracture is one of
ISSN:1672-6561