麻黄山西区延长组长4 k 5至长6储层成岩作用及成岩演化史研究

李顺利; 李胜利; 于兴河; 杜伟维

麻黄山西区延长组长4 k 5至长6储层成岩作用及成岩演化史研究

中国地质大学能源学院，北京 100083

基金项目:

中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室开放基金项目 EEL2008-6

详细信息

作者简介:
李顺利(1987-)，男，硕士在读，矿产普查与勘探，E-mail: 2005lishunli@163.com

通讯作者:
李胜利，男，副教授.中国地质大学（北京）能源学院.邮编：100083，联系电话：010-82321551

中图分类号: TE122.2
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出版历程
- 收稿日期: 2009-08-21
- 刊出日期: 2009-12-01

RESERVOIR DIAGENESIS AND DIAGENETIC EVOLUTION HISTORY OF 4^th + 5^th-6^th MEMBERS IN YANCHANG FORMATION, WESTERN MAHUANGSHAN, ORDOS BASIN

School of Energy Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 麻黄山西区长4 + 5至长6储层为一套三角洲前缘亚相的细砂岩，研究证明砂岩目前处于中成岩A期。机械压实与肢结作用是孔隙减少的主要作用，也是本区原生孔隙少、储集物性差的直接原因；而大气淡水的淋滤作用及有机酸溶蚀作用，尤其是有机酸溶蚀作用，是产生次生孔隙的主要作用，使局部储层物性有所改善，因此次生孔隙是本区油气的主要储集空间，下一步油气勘探开发应注重对有利次生孔隙空间的预测。
- 麻黄山西区 /
- 长4 + 5至长6段 /
- 成岩作用 /
- 成岩演化史
Abstract: The reservoirs of 4^th + 5^th-6^th Members of Yanchang Formation in west Mahuangshan were fine sandstone of delta front. The diagenesis in this area had reached A-period of middle diagenetic stage. The mechanical compaction and cementation had resulted in the poor physical property of the reservoir and that was the reason of reservoir lacking primary pores. However, the eluviation by atmospheric water and corrosion by organic acid were helpful to the local reservoir with induced pore. The next step of petroleum exploration and development should be focused on the forecast of favorable areas with induced pore.
- western Mahuangshan /
- 4^th + 5^th-6^th Members in Yanchang Formation /
- diagenesis /
- diagenetic evolution history

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图 1 研究工区区域位置图

Figure 1. Tectonic position map of research area

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图 2 长4 + 5及长6段砂岩成分分类图

Q.石英；F.长石；R.岩屑

Figure 2. The composition diagrams of sandstones of 4^th + 5^th-6^th Members of Yanchang Formation

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图 3 长4 + 5及长6段储层物性

Figure 3. The physical property of reservoir of 4^th + 5^th-6^th Members of Yanchang Formation

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图版

说明：1.颗粒呈点一线接触，泥质岩屑呈假杂基状充填于孔隙中，ND14井，普通，G4 + 5₂¹，2408.77m；2.颗粒呈凹凸接触，见石英次生加大，ND14井，普通，G4 + 5₂²，2406.55m；3.碳酸盐矿物胶结，ND3井，普通，C6₁¹，2493.69m；4.方解石交代碎屑颗粒，ND109井，普通，C6₁²，2570.20m；5.溶蚀孔隙，ND14井，铸体，G4 + 5₂²，2415.42m；6.层理缝，ND109井，普通，C6₁²，2576.35m

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图 4 水下分流河道的碳酸盐肢结作用（ND14井）

SP—自然电位；mV—毫伏；GR—自然伽马；API—计数率

Figure 4. The carbonate cementation in distributary channels of well ND14

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图 5 水下分流河道中方解石交代作用（ND109井）

SP—自然电位；mV—毫伏；GR—自然伽马；API—计数率条件是pH

Figure 5. The calcite metasomatism in distributary channels of well ND109

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图 6 沿层理分布的溶蚀缝（ND3）

SP—自然电位；mV—毫伏；GR—自然伽马；API—计数率

Figure 6. The fractures distributed with the bedding of well ND3

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图 7 长4 + 5及长6段砂岩成岩作用阶段及成岩序列

R_o.镜质体反射率；I/S.伊利石/蒙脱石

Figure 7. Diagenetic stages and sequences of 4^th + 5^th-6^th Members in Yanchang Formation

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图 8 长4 + 5及长6段成岩演化史一ND17井为例

Ⅰ.早期机械压实胶结作用阶段；Ⅱ大气淡水淋滤作用阶段；Ⅲ.中期强烈压实压溶、胶结作用阶段；Ⅳ.有机酸溶蚀作用阶段；Ⅴ.石油侵位阶段；Ⅵ.晚期铁方解石、铁白云石胶结作用阶段；R_o一镜质体反射率

Figure 8. Diagenetic evolution of 4^th + 5^th-6^th Members in Yanchang Formation (ND17)

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表 1 长4 + 5及长6段砂岩粘土矿物相对含量^①

Table 1. The relative content of clay mineral of sandstone of 4^th + 5^th-6^th Members of Yanchang Formation

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