川西龙门山前带雷口坡组四段古表生期大气水溶蚀作用对储集层的影响

李勇; 邓美洲; 李国蓉; 高恒逸; 王琼仙; 何赛

doi:10.11781/sysydz202101056

川西龙门山前带雷口坡组四段古表生期大气水溶蚀作用对储集层的影响

doi: 10.11781/sysydz202101056

1.
中国石化西南油气分公司勘探开发研究院, 成都 610041
2.
成都理工大学油气藏地质及开发工程国家重点实验室, 成都 610059

基金项目:

国家科技重大专项“川西山前带潮坪相白云岩储层地震预测应用研究” 2017ZX05005-004-010

中国石化重大科技攻关项目“龙门山前雷口坡组气藏综合评价及开发技术政策研究” P16111

详细信息

作者简介:
李勇(1983-), 男, 硕士, 高级工程师, 从事碳酸盐岩气藏地质研究。E-mail: lycup0214@163.com

通讯作者:
邓美洲(1980-), 男, 硕士, 高级工程师, 从事油气藏开发地质研究。E-mail: dmzmaidy@126.com

中图分类号: TE122.2
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出版历程
- 收稿日期: 2020-08-20
- 修回日期: 2021-01-03
- 刊出日期: 2021-01-28

Palaeokarst characteristics and effects on reservoirs in the fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

1.
Exploration and Production Research Institute, Southwest Oil and Gas Company, SINOPEC, Chengdu, Sichuan 610041, China
2.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China

摘要

摘要: 川西龙门山前带雷口坡组四段主要岩石类型为潮坪相白云岩。该套白云岩储层的形成主要受沉积相带、白云化作用和溶蚀作用控制。利用岩心观察、薄片分析、激光碳氧同位素、探针微量元素、阴极发光及包裹体测温等实验手段，对溶蚀作用进行研究。研究表明该储层经历了3期溶蚀作用，即准同生期、古表生期和埋藏期，分别形成粒内溶孔及铸膜孔、膏溶孔洞以及沿裂缝或缝合线分布的溶蚀孔洞。深入研究古表生期岩溶作用和膏溶作用发现，印支Ⅰ幕大气水作用的识别标志有不规则网络状风化裂缝、岩溶及膏溶膏变角砾岩、保持石膏板状形态或直角边形态的去膏化方解石、广泛发育的膏模孔及膏溶孔洞，同时具有低的碳氧稳定同位素值、宽值域的锶同位素值、低含量的Sr-Mn-Fe-K-Na微量元素、低温单相水溶包裹体等地球化学特征，印支Ⅰ幕大气水作用下含膏白云岩内膏溶作用是储集层形成的关键作用。
- 古表生溶蚀 /
- 白云岩储层 /
- 雷口坡组四段 /
- 龙门山前带 /
- 川西坳陷 /
- 四川盆地
Abstract: Dolostones of tidal flat facies are the major reservoir rock type of the fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin. The reservoir controls are dominated by phase belt, dolomitization and denudation. Core observation, cast thin section identification, laser carbon and oxygen isotopes, cathode luminescence, electron probe and inclusion thermometry were used to study the denudation effect. This reservoir went through three periods of denudation, including penecontemporaneous period, epidiagenetic period and buried period, which separately formed intragranular and moldic pores, gypsum caves, and fault-line cavities. The studies of karstification and gypsum dissolution in the paleo-epigenetic period showed that, the distinguishing signs of meteoric water impacts in episode I of the Indosinian Movement include the irregular network of weathering cracks, karst and gypsum breccia, de-anointed calcite maintaining gypsum board shape or right-angle edge shape, widely developed paste mold holes and paste-dissolved holes. These products are featured by low carbon and oxygen stable isotope values, a wide range of strontium isotope values, low content of Sr-Mn-Fe-K-Na trace elements, low-temperature single-phase water-soluble inclusions. The dissolution of gypsum in episode I of the Indosinian Movement is the key for reservoir generation.
- palaeokarst /
- dolomite reservoir /
- fourth member of Leikoupo Formation /
- Longmen Mountain front /
- Western Sichuan Depression /
- Sichuan Basin

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图 1 川西龙门山前带钻井分布和地层综合柱状图

据文献[4]修改。

Figure 1. Borehole locations and stratigraphic sequence of Longmen Mountain front, western Sichuan Basin

下载: 全尺寸图片幻灯片

图 2 川西龙门山前带雷口坡组四段古表生期大气水溶蚀作用识别标志

a.浅灰色微晶白云岩，岩心表面见网络状风化裂缝，A7井，4-5/45(岩心编号表示第4回次取心45块岩心中的第5块，下文相同含义)，岩心照片；b.灰色微晶白云岩，不规则裂缝，A7井，4-4/45，普通薄片，单偏光，100-；c.灰色微晶白云岩，不规则裂缝内充填白云石泥，A7井，4-4/45，阴极发光，100-；d.膏溶膏变角砾岩，呈椭圆状，A5井，8-11/83，岩心照片；e.灰色膏溶膏变角砾岩，A2井，5-4/33，普通薄片，单偏光，100-；f.灰色膏溶膏变角砾岩，不发光，A2井，5-4/33，阴极发光，100-；g.含灰白云岩，见去膏化方解石，A1井，1-56/57，普通薄片，单偏光，50-；h.含云灰岩，A4井，4-59/66，普通薄片，单偏光，100-；i.含云灰岩，不发光，A4井，4-59/66，阴极发光，100-；j.藻云岩，顺层分布的膏模孔，A2井，10-10/45，岩心照片；k.藻砂屑云岩，孤立分布的孔洞，A5井，7-13/88，岩心照片；l.藻云岩，具有直角边的膏溶孔，蓝色为灌注的铸体，代表储集空间，A2井，10-43/45，铸体薄片，100-

Figure 2. Identification of palaeokarst in fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

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图 3 川西龙门山前带雷四段成岩演化序列

Figure 3. Diagenetic sequences of fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

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图 4 川西龙门山前带雷四段古表生期(印支期Ⅰ幕)大气水溶蚀作用成储模式

Figure 4. Reservoir formation model of atmospheric water denudation in epidiagenetic period (in episode I of the Indosinian Movement), fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

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表 1 川西龙门山前带雷四段古岩溶产物地球化学特征

Table 1. Geochemical characteristics of palaeokarst deposits in fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

序号	井号	岩心块号	产状	δ¹³C_PDB/‰	δ¹⁸O_PDB/‰	锶同位素⁸⁷Sr/⁸⁶Sr	K/(μg·g^-1)	Na/(μg·g^-1)	Sr/(μg·g^-1)	Mn/(μg·g^-1)	Fe/(μg·g^-1)	均一法温度/℃	冰点/℃	盐度/%
1	A7	2-4/22	①	0.69	-5.67	0.707 807 60			251
2	A7	2-14/22	②	1.18	-5.48	0.707 863 66	< 0.01	0.02	985	23	0.01
3	A2	6-12/54	③	0.77	-7.67	0.707 916 76	< 0.01	0.04	94.4	7	0.11	126.1	-9.0	12.9
4	A2	7-16/29	③	-0.15	-6.77		0.34	0.48	62.8	< 5	0.27	115.1	-6.9	10.4
5	A2	9-19/49	③	1.59	-6.63	0.708 076 72	< 0.01	0.02	274	11	< 0.01	122.4	-9.4	13.3
6	A2	9-49/49	③	0.85	-7.93	0.709 386 24	0.01	0.05	256	< 5	0.02	129.1	-6.9	10.4
7	A8	2-19/44	③	0.97	-5.18		0.01	0.06	214	< 5	0.03
8	A5	4-15/58	③	-0.38	-8.55
9	A5	4-28/58	③	0.35	-7.71	0.708 451 31	< 0.01	0.04	972	< 5	0.01	116.4
10	A5	4-56/58	③	0.69	-8.89	0.708 125 90			196.5
11	A5	5-25/67	③	-1.07	-7.61				328			113.4	-10.6	14.6
12	A5	6-49/79	③	0.90	-9.01		< 0.01	0.08	81.9	< 0.01	123.2
13	A5	6-55/79	③	0.07	-8.36		< 0.01	0.04	218	< 5	0.01
14	A6	2-21/60	③	0.67	-7.31	0.707 789 16						130.1
15	A1	1-56/57	③	1.17	-6.23
16	A2	1-54/67	④	1.67	-7.44
17	A2	4-45/60	④	0.63	-7.46	0.708 392 08	< 0.01	0.03	322	< 5	0.01
18	A2	8-14/33	④	0.83	-7.79	0.708 569 25	< 0.01	0.02	143	5	< 0.01
19	A5	1-68/76	④	0.85	-8.96		< 0.01	0.05	146	< 5	0.01	114.0
20	A5	7-77/88	④	0.37	-7.42	0.708 293 81			478			137.2	-6.5	9.9
21	A5	8-11/83	④	-2.30	-8.86
22	A5	8-14/83	④	1.23	-6.58	0.708 296 66	< 0.01	0.01	266	11	0.01
23	A2	2-22/66	⑤	1.46	-5.94	0.707 923 88			246
24	A2	2-35/66	⑤	1.11	-5.91	0.708 129 75			244
25	A7	3-1/26	⑥	-0.26	-7.30
26	A5	2-57/73	⑥	1.37	-6.41	0.708 008 81	< 0.01	0.02	271	7	< 0.01
27	A5	2-57/73	⑥	1.40	-6.50	0.708 239 04	< 0.01	0.02	264	7	< 0.01
28	A5	2-60/73	⑥	1.47	-6.29
29	A6	1-37/73	⑥	1.86	-5.00	0.708 171 04	< 0.01	0.03	262	11	< 0.01
30	A8	6-30/75	⑦	1.74	-2.73	0.707 923 77			3 050
注：“产状描述”中，①指代微晶灰岩；②指代亮晶砂屑灰岩；③指代去膏化方解石；④指代膏溶孔洞方解石；⑤指代印支期Ⅰ幕的低角度裂缝方解石；⑥指代构造裂缝纤柱状方解石(印支期Ⅰ幕)；⑦指代受热液改造的高角度裂缝纤柱状—粒状方解石。

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