鄂尔多斯盆地三叠系延长组7段高伽马砂岩测井识别及其展布特征

游富粮; 柳广弟; 孙明亮; 李超正; 刘祥柏; 安成; 王子昕; 李亿殊

doi:10.11781/sysydz202301099

鄂尔多斯盆地三叠系延长组7段高伽马砂岩测井识别及其展布特征

doi: 10.11781/sysydz202301099

游富粮^{1, 2,},
柳广弟^{1, 2, ,},
孙明亮^{1, 2},
李超正³,
刘祥柏^{1, 2},
安成^{1, 2},
王子昕^{1, 2},
李亿殊^{1, 2}

1.
中国石油大学(北京) 地球科学学院，北京 102249
2.
油气资源与探测国家重点实验室，北京 102249
3.
中国石油勘探开发研究院，北京 100083

基金项目:

中国石油天然气集团有限公司—中国石油大学(北京)战略合作科技专项 ZLZX2020-02

详细信息

作者简介:
游富粮(1996—)，男，博士生，从事油气藏形成机理、分布规律和非常规油气研究。E-mail: 296772108@qq.com

通讯作者:
柳广弟(1961—)，男，博士，教授，从事油气藏形成与分布等方面的教学与科研工作。E-mail: lgd@cup.edu.cn

中图分类号: TE122.24
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- 文章访问数: 632
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- 被引次数: 0
出版历程
- 收稿日期: 2022-02-15
- 修回日期: 2022-11-29
- 刊出日期: 2023-01-28

Logging identification and distribution characteristics of high-gamma sandstones in the 7th member of Triassic Yanchang Formation, Ordos Basin

YOU Fuliang^{1, 2
,},
LIU Guangdi^{1, 2
, ,},
SUN Mingliang^{1, 2},
LI Chaozheng³,
LIU Xiangbai^{1, 2},
AN Cheng^{1, 2},
WANG Zixin^{1, 2},
LI Yishu^{1, 2}

1.
College of Geosciences, China University of Petroleum Beijing (Beijing), Beijing 102249, China
2.
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
3.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

摘要

摘要: 鄂尔多斯盆地三叠系延长组长7段泥页岩层系内发育大量的砂岩夹层，这些砂岩夹层常伴有自然伽马值异常高的现象，部分砂岩的自然伽马值可高达330.5 API，在测井剖面上极易与泥页岩混淆。为识别高伽马砂岩，按照粒度和结构特征将该区延长组长7段碎屑岩划分为细砂岩、粉砂岩、泥质粉砂岩、粉砂质泥岩、泥岩和页岩，并应用常规测井数据运算组合成2个新参数——参数A和参数B，参数A和参数B组成的交汇图版以及自然伽马测井曲线，可有效区分识别出长7段中的正常砂岩和高伽马砂岩。长7段高伽马砂岩的累计厚度平面展布图表明，高伽马砂岩主要位于研究区的西南部；高伽马砂岩由湖盆边缘向湖盆中心呈指状发散展布的特征指示，其形成可能与长7段沉积期间的火山喷发有关。
- 高伽马砂岩 /
- 岩性识别 /
- 长7段 /
- 延长组 /
- 三叠系 /
- 鄂尔多斯盆地
Abstract: A large number of sandstone interlayers were developed in the shale strata of the 7th member of the Triassic Yanchang Formation (Chang 7 member) in the Ordos Basin. These sandstone interlayers are frequently accompanied by abnormally high natural gamma values as high as 330.5 API. As a result, they are undistingui shable from shale on well profile. To characterize the high-gamma sandstones, the clastic rocks of the Chang 7 member were classified into fine sandstone, siltstone, argillaceous siltstone, silty mudstone, mudstone and shale according to grain size and structural characteristics. Conventional logging data were recalculated and combined into two new parameters—A and B. The new intersection chart composed of parameters A and B and natural gamma logging data can effectively distinguish and identify normal sandstone and high-gamma sandstone in the Chang 7 member. The plane distribution of cumulative thickness of high-gamma sandstone in the Chang 7 member shows that the high-gamma sandstone is mainly located in the southwest of the study area. The finger-like distribution of high-gamma sandstone from the edge to the center of the lake basin indicates that its formation may be related to the volcanic eruption during sedimentary period.
- high-gamma sandstone /
- lithologic identification /
- Chang 7 member /
- Yanchang Formation /
- Triassic /
- Ordos Basin

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图 1 鄂尔多斯盆地三叠系延长组长7段页岩和研究区分布范围

页岩厚度等值线据文献[22]。

Figure 1. Location of study area and distribution of Chang 7 shale, Triassic Yanchang Formation, Ordos Basin

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图 2 鄂尔多斯盆地三叠系延长组长7段碎屑岩岩心照片

a.Zhe86井，2 410.4 m，灰色细砂岩，交错层理；b.Zhu174井，1 624.5 m，黑灰色粉砂岩，交错层理；c.Li287井，1 959.6 m，灰黑色泥质粉砂岩，块状层理，断面较粉砂岩更平整；d.Xi233井，1 942.1 m，灰黑色粉砂质泥岩，块状层理；e.Gen138井，2 734.92 m，黑色泥岩，块状层理；f.Hua317井，2 467.5 m，黑色页岩，水平层理，可见水平层理缝

Figure 2. Core photos of clastic rocks in Chang 7 member, Triassic Yanchang Formation, Ordos Basin

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图 3 鄂尔多斯盆地Zhu233井三叠系延长组长7₃亚段高伽马砂岩测井剖面

岩心物性数据据长庆油田。

Figure 3. Logging profile of high-gamma sandstones in Chang 7₃ sub-member, Triassic Yanchang Formation, well Zhu 233, Ordos Basin

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图 4 鄂尔多斯盆地三叠系延长组长7段泥页岩层系内不同岩性测井响应

Figure 4. Logging response of different lithologies in mud shale strata, Chang 7 member, Triassic Yanchang Formation, Ordos Basin

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图 5 鄂尔多斯盆地三叠系延长组长7段岩性测井识别参数A和参数B交汇图版

Figure 5. Intersection chart of parameters A and B for lithology logging identification of Chang 7 member, Triassic Yanchang Formation, Ordos Basin

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图 6 鄂尔多斯盆地三叠系延长组长7段高伽马砂岩测井识别流程

Figure 6. Flow chart of logging identification of high-gamma sandstones in Chang 7 member, Triassic Yanchang Formation, Ordos Basin

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图 7 鄂尔多斯盆地CY1井和Nin76井的岩性识别效果

取心描述数据据长庆油田。

Figure 7. Lithology identification effect of wells CY 1 and Nin 76 in Ordos Basin

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图 8 鄂尔多斯盆地三叠系延长组长7段高伽马砂岩累计厚度分布

Figure 8. Contour map of accumulated thickness of high-gamma sandstones in Chang 7 member, Triassic Yanchang Formation, Ordos Basin

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表 1 鄂尔多斯盆地三叠系延长组长7段泥页岩层系内不同岩性测井数值

Table 1. Logging response of different lithologies in mud shale strata, Chang 7 member, Triassic Yanchang Formation, Ordos Basin

岩性	AC/(μs·m^-1)	GR/API	CNL/%	DEN/(g·cm^-3)	SP/mV	CLL8/(Ω·m)^-1	CILD/(Ω·m)^-1
细砂岩	$ \frac{191.8 \sim 244.2}{220.8}$	$ \frac{86.8 \sim 189.0}{116.5}$	$\frac{9.2 \sim 20.7}{15.6} $	$\frac{2.5 \sim 2.7}{2.6} $	$\frac{1.4 \sim 87.4}{71.4} $	$ \frac{4.4 \sim 55.7}{24.3}$	$ \frac{5.6 \sim 60.2}{18.9}$
粉砂岩	$ \frac{209.2 \sim 262.8}{227.4}$	$ \frac{90.2 \sim 217.8}{140.1}$	$\frac{12.3 \sim 26.1}{18.1} $	$ \frac{2.4 \sim 2.7}{2.5}$	$ \frac{-2.5 \sim 87.3}{55.1}$	$\frac{1.1 \sim 46.1}{16.4} $	$ \frac{2.5 \sim 74.9}{18.7}$
泥质粉砂岩	$\frac{220.3 \sim 269.6}{232.9} $	$ \frac{90.9 \sim 330.5}{149.2}$	$\frac{12.9 \sim 25.5}{19.6} $	$\frac{2.4 \sim 2.7}{2.6} $	$\frac{-0.4 \sim 106.9}{66.7} $	$\frac{0.6 \sim 111.0}{23.8} $	$\frac{2.1 \sim 84.8}{22.1} $
粉砂质泥岩	$\frac{228.2 \sim 265.5}{244.6} $	$\frac{99.3 \sim 397.4}{174.0} $	$\frac{17.6 \sim 31.4}{23.6} $	$ \frac{2.4 \sim 2.7}{2.6}$	$ \frac{-0.4 \sim 116.0}{60.2}$	$ \frac{13.4 \sim 174.3}{40.3}$	$ \frac{9.4 \sim 149.6}{37.5}$
泥岩	$\frac{246.2 \sim 288.0}{263.4} $	$ \frac{115.0 \sim 254.0}{156.2}$	$ \frac{19.8 \sim 34.4}{27.9}$	$ \frac{2.4 \sim 2.6}{2.5}$	$ \frac{55.9 \sim 118.1}{94.0}$	$\frac{8.4 \sim 77.3}{29.0} $	$\frac{7.9 \sim 64.0}{33.2} $
页岩	$ \frac{247.7 \sim 354.1}{286.8}$	$ \frac{111.0 \sim 701.1}{277.0}$	$\frac{20.9 \sim 52.9}{32.9} $	$\frac{2.1 \sim 2.6}{2.4} $	$\frac{46.2 \sim 119.7}{68.6} $	$\frac{0.5 \sim 283.4}{27.5} $	$\frac{0.6 \sim 247.7}{27.6} $
注：表中分式意义为$ \frac{\text { 最小值} \sim \text {最大值}}{\text { 平均值 }}$。

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表 2 鄂尔多斯盆地三叠系延长组相对高自然伽马砂岩储层的测井响应特征^[3]

Table 2. Logging response characteristics of relatively high natural gamma sandstone reservoirs in Triassic Yanchang Formation, Ordos Basin

项目	常规砂岩储层	相对高自然伽马砂岩储层	泥质岩石
微电极(微电位、微梯度)	两条曲线呈现明显正幅度差	两条曲线呈现明显正幅度差	两条曲线基本重叠或正负不定幅度差
自然电位(SP)	明显负异常	明显负异常	基线附近，平直
自然伽马(GR)	低值	相对高值	中—高值
自然电位(SP)与自然伽马(GR)曲线幅度差	按照曲线左右幅度基本重合的原则，两条曲线基本重叠	按照曲线左右幅度基本重合原则，两条曲线之间存在明显幅度差	两条曲线基本重叠
声波时差(AC)曲线	相对低—中值	相对高值	中—高值
双感应(ILD)—八侧向(LL8)曲线	相对中—高值，特征明显，不同探测范围电阻率曲线之间一般存在差异	相对低值，特征明显，不同探测范围的电阻率曲线之间一般存在差异	一般为低值，含有机质时为相对高值，曲线之间基本重叠
视电阻率(R_a)曲线	相对高值	相对低值	一般为低值，含有机质时为相对高值
声波时差(AC)—自然电位(SP)曲线重叠图	明显幅度差	明显幅度差	曲线基本重叠
深感应(Rd)—声波时差(英制)曲线重叠图	含油时存在明显幅度差，干层、水层处两条测井曲线基本重叠	对含油性反映不灵敏，含油层、水层、干层处两条测井曲线基本重叠	一般重叠，含有机质时曲线存在幅度差
计算自然电位与实测自然电位(SP)曲线重叠图	含油时存在明显幅度差，干层、水层处两条测井曲线基本重叠	含油时存在明显幅度差，干层、水层处两条测井曲线基本重叠	曲线基本重叠

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