不同泥浆体系下东海低渗储层测录井评价

罗健; 胡文亮; 何玉春; 刘春峰; 王猛

doi:10.16562/j.cnki.0256-1492.2019070403

不同泥浆体系下东海低渗储层测录井评价

1.
中海石油（中国）有限公司上海分公司，上海 200030

2.
中海油田服务股份有限公司，燕郊 065201

基金项目: “十三五”国家科技重大专项“东海深层低渗—致密天然气勘探开发技术”（2016ZX05027）

详细信息

作者简介: 罗健（1987—），男，工程师，从事测井研究工作，E-mail：luojian4@cnooc.com.cn

中图分类号: P744.4

收稿日期: 2019-07-04

修回日期: 2019-09-24

刊出日期: 2019-12-25

Logging evaluation for low permeability reservoirs under different mud systems in East China Sea

1.
Shanghai Branch of CNOOC Ltd, Shanghai 200030, China

2.
China Oilfield Service Limited, Yanjiao 065201, China

Received Date: 04 July 2019

Revised Date: 24 September 2019

Publish Date: 25 December 2019

摘要

摘要:
东海油气资源丰富，其中低孔低渗储层的油气资源占比约2/3，勘探前景广阔。在勘探期间，偶尔见储层物性相对较好，低产的现象。为了明确储层低产的原因，改善储层的产能问题，研究发现水基泥浆对油气层有着不可逆的污染现象，为此东海推行油基泥浆新体系。在新泥浆体系下，测井和录井等资料采集的环境发生改变，油基泥浆环境下，油气层与水层的侵入现象与水基泥浆完全相反，油气层无侵入，水层侵入明显；录井中气测组分以及荧光信息受油基泥浆影响较大，气测组分容易被油基泥浆吸收，并且荧光信息混杂有泥浆荧光，因此，对油气水层识别及定量评价不能忽略油基泥浆带来的影响。本文对比不同泥浆环境下测录井资料解释方法的差异，为东海建立快速有效的油气识别方法提供依据。
- 油基泥浆 /
- 储层保护 /
- 储层污染
Abstract:
The East China Sea has rich oil and gas resources, in which the low porosity and low permeability reservoirs account for two-thirds of the total and hence are of great importance for exploration. It is occasionally found during exploration that some of the reservoirs have good physical properties, but low production. Efforts have been made to find out the reasons for such a phenomenon and the ways to improve the productivity. Our study found that water-based mud has irreversible pollution to the oil and gas reservoir, and thus oil-based mud is recommended. In the new mud system, the environment for well logging and mud logging are opposite. In the environment of oil-based mud, the invasion phenomenon is completely different for oil-gas reservoir and water reservoir. For oil and gas reservoirs, there is no mud invasion. For water reservoirs, however, mud invasion is common. Besides, the mud environment has great impact on the component of gas logging and fluorescence data. Some of the components may be absorbed by oil based mud and the fluorescence disturbed. In conclusion, the influence of oil based mud can not be ignored, when identification and quantitative evaluation are made for oil, gas and water reservoirs. By comparing some well logging and mud logging interpretation methods in different mud environment, we have established in this paper a fast and effective method for identification of oil and gas reservoirs in the East China Sea.
- oil-based mud /
- reservoir protection /
- reservoir pollution

HTML全文

图 1 NBxx-5-1s井H6与P2层测井解释成果图

Figure 1.

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图 2 NBxx-5-1s井随钻电阻率复测前后对比图

Figure 2.

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图 3 NBxx-5-2井电阻率随钻测量与复测值对比组合图

Figure 3.

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图 4 NBxx-5-2井4 471.5 mMDT泵抽流体性质综合识别图

Figure 4.

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图 5 研究区气测快速识别图版

Figure 5.

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图 6 NBxx-6-2井测井资料综合图

Figure 6.

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图 7 研究区4口井井筒环境对比

Figure 7.

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图 8 水基泥浆电阻率“低侵”与油基泥浆电阻率“高侵”对比

Figure 8.

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图 9 油基泥浆中子含氢校正

Figure 9.

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图 10 NBxx-5-1s井核磁测井综合图

Figure 10.

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图 11 NBxx-6-2井核磁测井综合图

Figure 11.

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图 12 低孔低渗储层不同泥浆体系下流度与岩心渗透率交会图

Figure 12.

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表 1 NBxx-5-1s井DST2与DST3综合对比表

Table 1. Comparison of DST2 and DST3 in NBxx-5-1s

特征参数	DST2	DST3
特征参数	P2	H6
射孔深度段（m）		4 198.0～4 220.0
	4 439.4～4 470.2	4 228.1～4 237.0
		4 239.8～4 248.1
	4 475.3～4 493.8	4 258.1～4 261.8
		4 265.2～4 277.0
射开厚度（m）	49.3	54.7
钻井泥浆比重（sg）	1.36	1.36
机械转速（m/h）	6～7.5	8～15
气测全量（%）	10～11.53	5～17.6
电阻率（Ω•m）	40～61	34～40
储层孔隙度（%）	8～11.2	8～11.2
测压流度（mD/cp）	2.3～12.7/平均8.89	2.3～3.3/平均2.74
核磁渗透率（mD）诱喷压差（Mpa）	5～1015.5	1～325.5
液垫	海水	柴油
射孔弹类型	692SD-127P-1	SDP45PYX39-3
射孔穿深（mm）	909	1 447
工作制度	二开二关	二开二关

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表 2 NBxx-5-1s、NBxx-6-2录井荧光显示表

Table 2. Logging fluorescence of NBxx-5-1s and NBxx-6-2

井名	深度/m		岩性	荧光录井
	深度/m			直照		滴照
	顶	底		颜色	面积/%	颜色	反应
NBxx-5-1s	4 198.0	4 238.0	灰白色/浅灰色细砂岩、泥质粉砂岩	无	/	无	/
	4 240.0	4 248.0	浅灰色细砂岩	无	/	无	/
	4 250.0	4 252.0	浅灰色细砂岩	无	/	无	/
	4 258.0	4 264.0	灰色泥质细砂岩	无	/	无	/
	4264.5	4 284.5	浅灰色粉砂岩、细砂岩	无	/	无	/
NBxx-6-2	3 712.0	3 721.0	细砂岩	暗黄色	5	乳白色	慢
	3 729.0	3 735.0	细砂岩	暗黄色	10	乳白色	慢
	3 736.0	3 750.0	细砂岩	暗黄色	10	乳白色	慢
	3 761.0	3 766.0	细砂岩	暗黄色	5	乳白色	慢
	3 775.0	3 797.0	细砂岩	暗黄色	5	乳白色	慢

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表 3 NBxx-6-2井3 743.5 m泵抽信息表

Table 3. MDT pumping information, depth of 3 743.5 m, Well NBxx-6-2

深度/m	探针类型	流度	泵抽时间	泵抽体积/L	取样情况	IFA流体识别结论	GOR气油比/（m³/m³）
3 743.5	椭圆形探针	83.96	73	28.6	2PVT	油层	319.2
3 760	椭圆形探针	66.7	57	11	1PVT	气层	13 523.9

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表 4 研究区4口井钻井周期对比

Table 4. Comparison of drilling cycles for the four wells from the research area

井名	完钻井深/m	钻井天数	备注
NBxx-5-1s	4 850	59	水基泥浆
NBxx-7-1	4 480	20	油基泥浆
NBxx-5-2d	4 680	15	油基泥浆
NBxx-5-3	4 500	28	油基泥浆

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