绿泥石与浊沸石矿物特征及其对储集层物性的影响——以准噶尔盆地陆梁隆起西部下乌尔禾组为例

doi:10.7657/XJPG20250102

摘要/Abstract

摘要：

为增强对准噶尔盆地陆梁隆起西部二叠系下乌尔禾组绿泥石和浊沸石矿物特征的认识，利用岩石薄片、电子探针、X射线衍射等，对其化学成分、产出状态及其对储集层物性的影响进行了研究。研究区下乌尔禾组绿泥石矿物晶体结构为三八面体，具孔隙衬里式、颗粒包膜式和孔隙充填式3种产出状态，属于铁镁过渡型偏富镁绿泥石，其八面体位置主要为Fe对Mg的置换，Al/（Al+Mg+Fe）为0.25~0.37，发育泥质岩石蚀变和镁铁质岩石转化形成的绿泥石，凝灰质等火山物质的水解溶蚀、黏土矿物之间的相互转化为其形成提供了大量的物质基础。浊沸石具连晶状、充填状和交代状3种产出状态，连晶状浊沸石周围发育大量岩屑，促进了浊沸石的形成；充填状浊沸石与绿泥石、方解石等矿物共生，在物质来源上相互竞争，在一定程度上抑制了浊沸石的形成；交代状浊沸石主要由交代长石和岩屑生成，导致Si/Al较高，耐酸性较强，不易被溶蚀。绿泥石与浊沸石对储集层物性均具有双重影响，绿泥石对储集层物性的改善作用较为明显，有利于形成优质储集层，浊沸石对改善储集层的作用较为有限。研究区下乌尔禾组随着埋藏深度增大，存在从碱性到弱酸性、再到碱性的成岩环境变化，其成岩系统较为封闭。

关键词: 准噶尔盆地, 陆梁隆起, 下乌尔禾组, 绿泥石, 浊沸石, 产出状态, 储集层物性

Abstract:

In order to enhance the understanding of mineral features of chlorite and laumontite in the lower Wuerhe formation of Permian in the western Luliang uplift, Junggar Basin, the chemical composition, occurrence states, and impacts on reservoir physical properties were studied by means of thin section, electron probe and X-ray diffraction. It is found that the chlorite has an trioctahedral crystal structure and occurs in three states: pore lining, particle coating, and pore filling. It is classified as an iron-magnesium transitional type, richer in magnesium. Fe replacing Mg mainly occurs in the octahedrons, with the Al/(Al+Mg+Fe) ratio ranging from 0.25 to 0.37. The forming of chlorite is attributed to the alteration of argillaceous rocks and the transformation of mafic rocks, with substantial material input from the hydrolytic dissolution of tuffaceous volcanic materials and the interconversion of clay minerals. Laumontite occurs in three states: crystal aggregate, filling, and replacement. The laumontite in crystal aggregate state is surrounded by numerous debris, which promotes the formation of laumontite. The laumontite in filling state coexists with chlorite, calcite and other minerals, which compete with them for material sources, partially inhibiting the formation of laumontite. The laumontite in replacement state is mainly formed by the replacement of feldspar and debris, resulting in high Si/Al ratio and good acid resistance, which allow the laumontite to be not easily dissolved. Chlorite and laumontite have dual effects on reservoir physical properties. Chlorite can significantly improve reservoir physical properties, resulting in the formation of high-quality reservoirs. In contrast, the effect of laumontite on reservoir properties is limited. With the increase of burial depth, the lower Wuerhe formation presents a variation in diagenetic environment from alkaline to weakly acidic and then to alkaline, with a relatively closed diagenetic system.

Key words: Junggar Basin, Luliang uplift, lower Wuerhe formation, chlorite, laumontite, occurrence state, reservoir physical property

中图分类号:

TE122.21

牛君, 王聪, 梁飞. 绿泥石与浊沸石矿物特征及其对储集层物性的影响——以准噶尔盆地陆梁隆起西部下乌尔禾组为例[J]. 新疆石油地质, 2025, 46(1): 13-21.

NIU Jun, WANG Cong, LIANG Fei. Mineral Features of Chlorite and Laumontite and Their Impacts on Reservoir Physical Properties: A Case Study of Lower Wuerhe Formation in Western Luliang Uplift, Junggar Basin[J]. Xinjiang Petroleum Geology, 2025, 46(1): 13-21.

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井名	测点	产状	含量测试结果/%
井名	测点	产状	SiO₂	Al₂O₃	MgO	FeO	Na₂O	CaO	K₂O	MnO	TiO₂	NiO	合计
XY2井	18-1	孔隙充填式	31.04	16.37	20.55	18.16	0.03	0.40	0.02	0.61	0.03	0.06	87.27
XY2井	18-7	孔隙充填式	30.84	15.42	20.69	17.56	0.03	0.42	0.03	0.58	0.02	0.09	85.68
YB4井	61-3	颗粒包膜式	30.57	18.04	18.98	18.10	0.01	0.47	0.01	0.27	0.05	0	86.50
	61-9	孔隙衬里式	30.15	12.72	17.67	23.52	0.09	0.29	0	0.42	0.05	0.16	85.07
	61-11	颗粒包膜式	33.87	14.29	31.31	6.42	0.05	0.42	0.03	0.12	0	0.04	86.55
	61-12	颗粒包膜式	32.23	20.84	18.10	17.54	0.06	0.40	0.04	0.25	0.05	0	89.51
M218井	59-3	孔隙衬里式	29.82	19.39	14.82	21.36	0.03	0.40	0.06	0.25	0	0.03	86.16
Y001井	21-3	孔隙衬里式	29.56	15.48	23.28	19.55	0	0.45	0.04	0.52	0	0.04	88.92

井名	测点	产状	含量测试结果/%											Si/Al
井名	测点	产状	SiO₂	Al₂O₃	MgO	FeO	Na₂O	CaO	K₂O	TiO₂	NiO	MnO	合计	Si/Al
YB4井	61-1	连晶状	57.48	21.20	0.04	0.04	0.29	10.25	0.06	0.02	—	—	89.38	2.16
	61-2	连晶状	53.56	20.56	—	0.04	0.17	11.09	0.02	0.02	0.02	0.02	85.50	2.08
	61-4	连晶状	53.91	20.64	0.04	0.06	0.24	10.81	0.07	0.03	—	—	85.80	2.08
	65-5	连晶状	53.61	20.37	—	—	0.05	10.43	0.05	0.02	0.04	—	84.57	2.10
	65-7	连晶状	52.58	20.52	0.04	0.05	0.07	10.85	0.03	—	—	0.02	84.16	2.04
	65-4	充填状	52.06	20.63	—	0.07	—	11.30	—	0.03	—	—	84.09	2.01
	65-6	充填状	56.44	20.72	0.05	0.14	0.21	10.38	0.06	—	—	0.02	88.02	2.17
	68-2	充填状	54.32	20.19	—	0.12	0.28	10.49	0.08	—	—	—	85.48	2.14
	68-6	充填状	53.77	20.98	0.06	0.12	0.02	11.21	—	—	—	—	86.16	2.04
XY2井	18-4	交代状	53.10	20.23	—	0.13	0.25	10.38	0.10	0.03	—	—	84.22	2.09
XY2井	18-5	交代状	53.20	19.39	0.02	0.03	0.52	10.11	0.14	—	0.02	—	83.43	2.19
Y001井	21-1	交代状	54.10	20.03	0.05	—	0.30	10.27	0.17	—	0.04	—	84.96	2.15
Y001井	21-2	交代状	53.32	19.53	—	0.08	0.32	10.43	0.12	—	0.02	—	83.82	2.17