鄂尔多斯盆地南部旬宜地区古生界天然气成藏条件及主控因素

doi:10.12108/yxyqc.20240608

岩性油气藏 ›› 2024, Vol. 36 ›› Issue (6): 77–88.doi: 10.12108/yxyqc.20240608

鄂尔多斯盆地南部旬宜地区古生界天然气成藏条件及主控因素

关蕴文¹, 苏思羽², 蒲仁海¹, 王启超³, 闫肃杰¹, 张仲培³, 陈硕², 梁东歌⁴

1. 西北大学地质学系, 西安 710069;
2. 陕西省煤田物探测绘有限公司, 西安 710000;
3. 中国石化石油勘探开发研究院, 北京 102206;
4. 中国石油长庆油田分公司第二采气厂, 陕西榆林 719000

收稿日期:2024-06-06 修回日期:2024-07-04 出版日期:2024-11-01 发布日期:2024-11-04
第一作者:关蕴文（1997—）,女,西北大学在读博士生,研究方向为油气地质勘探与地震资料解释。地址:（710069）陕西省西安市太白北路229号。Email:gynw_6@163.com
通信作者: 蒲仁海（1962—）,男,博士,教授,主要从事油气地质与地球物理方面的研究工作。Email:purenhai@126.com
基金资助:
中国石化科技部项目“中西部叠合盆地重点领域成藏富集规律与突破区带评价优选”（编号：P24167）资助。

Palaeozoic gas reservoir-forming conditions and main controlling factors in Xunyi area，southern Ordos Basin

Guan Yunwen¹, Su Siyu², Pu Renhai¹, Wang Qichao³, Yan Sujie¹, Zhang Zhongpei³, Chen Shuo², Liang Dongge⁴

1. Department of Geology, Northwest University, Xi'an 710069, China;
2. Shaanxi Coalfield Geophysical Surveying and Mapping Co., Ltd, Xi'an 710069, China;
3. Sinopec Petroleum Exploration and Production Research Institute, Beijing 102206, China;
4. The Second Gas Production Plant, Changqing Oilfield Company, Yulin 719000, Shannxi, China

Received:2024-06-06 Revised:2024-07-04 Online:2024-11-01 Published:2024-11-04

摘要/Abstract

摘要： 鄂尔多斯盆地南部古生界勘探开发前景广阔，但勘探成效不理想。基于最新钻井岩心分析测试资料、测井资料、二维/三维地震资料等，对旬宜古生界气源条件、储层质量、源储配置、断裂输导性等4个方面分别进行了评价。研究结果表明：①鄂尔多斯盆地南部旬宜地区发育太原组—山西组黑色煤岩、黑色炭质泥岩、深灰色、灰色泥岩等潜在烃源岩类型，有机质类型均为Ⅲ型，R_o为1.8%～2.5%，热演化程度较高，黑色煤岩、黑色炭质泥岩品质要高于深灰色、灰色泥岩，具有较好的生烃潜力。②研究区储层均为超低孔、超低渗储层，上古生界山西组和下石盒子组盒1段为碎屑岩储层，杂砂岩占比79%，杂基平均体积分数为29%，孔隙类型以粒间孔和次生溶孔为主，面孔率小于3%。盒1段为强胶结—弱溶蚀相，山西组为强压实—杂基强充填相。下古生界马家沟组碳酸盐岩优质储层岩性为砂屑云岩，储集空间以溶蚀孔、晶间孔和裂缝为主。③古生界源储配置关系包括下生上储、上生下储及旁生侧储，其中下古生界马家沟组主要为旁生侧储。研究区3期断裂分别发育于古生代、三叠纪、晚侏罗纪，其中晚侏罗纪的活动断裂具有良好的流体纵向输导作用。④下古生界天然气藏受控于前石炭纪古地貌，剥蚀厚度大的古洼槽东侧毗邻区是下古生界油气聚集的有利区带；上古生界气藏受控于有效输导体系，研究区北部储层物性差且缺乏开启性通源断裂是上古生界勘探失利的主要原因。

关键词: 天然气, 成藏条件, 储层特征, 源储配置, 断裂控藏, 古生界, 旬宜地区, 鄂尔多斯盆地

Abstract: The exploration and development prospects of the Paleozoic area in the southern Ordos Basin are promising，but the exploration results have been unsatisfactory. Based on the latest core analysis，data of logging and 2D/3D seismic，a comprehensive evaluation was conducted for the Palaeozoic of Xunyi area. This evaluation focused on four aspects：gas source conditions，reservoir quality，source-reservoir configuration，and fracture conductivity. The results show that：（1）In the Xunyi area，potential hydrocarbon source rock types have been identified in the Taiyuan-Shanxi formations：black coal rock，black carbonaceous mudstone，dark gray，and gray mudstone. The organic matter types are all Type Ⅲ，with a vitrinite reflectance（R_o）ranging from 1.8% to 2.5%，indicating a high level of thermal maturity. The black coal rock and carbonaceous mudstone exhibit better hydrocarbon generation potential compared to the dark gray and gray mudstones.（2）The reservoirs are charac terized by ultra-low porosity and ultra-low permeability. The upper Paleozoic Shanxi Formation and He 1 mem ber consist of clastic rock reservoirs，with lithic sandstones accounting for 79%，and matrix content averaging 29%. The pore types are mainly intergranular and secondary dissolution pores，with plane porosity lower than 3%. The He 1 member is characterized by strong cementation and weak dissolution facies，while the Shanxi For mation exhibits strong compaction and matrix-rich infill facies. The high-quality carbonate reservoirs of the lower Paleozoic Majiagou Formation are dominated by sandy dolomite，with storage space mainly comprising dissolu tion pores，intercrystalline pores，and fractures. （3）The Paleozoic source-reservoir configurations include “lower-generation upper-storage”，“upper-generation lower-storage”，and“adjacent lateral-storage”configura tions. Among these，the adjacent lateral-storage configuration is the favorable source-reservoir combination for the lower Paleozoic Majiagou Formation. The Xunyi area experienced three phases of fault development：Paleo zoic，Triassic，and late Jurassic，with the late Jurassic faults providing good vertical fluid migration pathways. （4）The lower Paleozoic gas reservoirs are controlled by the pre-Carboniferous paleogeomorphology. The area adjacent to the eastern side of the deeply eroded paleotroughs is a favorable zone for Lower Paleozoic hydrocar bon accumulation. The upper Paleozoic gas reservoirs are controlled by effective drainage systems. Poor reservoir properties and the lack of open source-conducting faults in the northern part of the study area are the main rea sons for the unfavorable results in the upper Paleozoic.

Key words: natural gas, accumulation conditions, reservoir characteristics, source-reservoir configuration, fault-controlled reservoir, Paleozoic, Xunyi area, Ordos Basin

中图分类号:

TE122.1

关蕴文, 苏思羽, 蒲仁海, 王启超, 闫肃杰, 张仲培, 陈硕, 梁东歌. 鄂尔多斯盆地南部旬宜地区古生界天然气成藏条件及主控因素[J]. 岩性油气藏, 2024, 36(6): 77–88.

Guan Yunwen, Su Siyu, Pu Renhai, Wang Qichao, Yan Sujie, Zhang Zhongpei, Chen Shuo, Liang Dongge. Palaeozoic gas reservoir-forming conditions and main controlling factors in Xunyi area，southern Ordos Basin[J]. Lithologic Reservoirs, 2024, 36(6): 77–88.

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鄂尔多斯盆地南部旬宜地区古生界天然气成藏条件及主控因素

Palaeozoic gas reservoir-forming conditions and main controlling factors in Xunyi area，southern Ordos Basin

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