鄂南镇泾地区长_8油层组沉积格架与储层质量的关系研究
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摘要
沉积格架与储层质量关系研究较少,综合运用岩心、测井及地球化学分析资料,对镇泾地区长_8~1和长_8~2小层沉积格架与储层质量关系进行研究。研究结果表明:根据单套砂体与有效泥岩隔夹层发育情况,长_8~1和长_8~2小层沉积格架可划分为单层式、夹层式和互层式3类;储层质量较好段多位于单套式砂体中部;单套砂体的厚度与储层质量较好段的厚度、物性呈明显的正相关关系,当单套砂体厚度小于7 m时,储层质量较好段基本不发育;压实和钙质胶结作用是储层质量受控于沉积格架的主要机理,压实作用从整体上控制了储层质量,砂体厚度大更有利于储集空间保存,从而形成优质储层,单套砂体顶底部钙质胶结比较发育,钙质胶结砂岩的厚度与相邻泥岩隔夹层的厚度相关性较好;砂岩与相邻泥岩碳氧同位素表明泥岩的压实排水是钙质胶结形成的主要原因。该研究建立了不同类型沉积格架与储层质量的关系,阐明了储层质量受控于沉积格架的机理,为少井条件下有利区优选奠定了基础。
The relationship between sedimentary framework and reservoir quality is less studied. In the paper,the core,well logging and geochemical analysis data were used to sudy the relationship between sedimentary framework and reservoir quality of Chang_8~1 and Chang_8~2 sublayers in Zhenjing area. The study results show that the sedimentary framework of Chang_8~1 and Chang_8~2 sublayers can be divided into 3 types like single layer type,sandwich-type and interbed-type based on the developmental state of single sand body and effective mudstone barrier/interbed;the interval with good reservoir quality is mostly located in the middle of single sand body; the thickness of single sand body is positively correlated with the thickness and physical properties of interval with good reservoir quality,and when the thickness of single sand body is less than 7 m,the interval with good reservoir quality is basically not developed; the compaction and calcitic cementation are the main mechanisms for the reservoir quality to be controlled by sedimentary framework,the compaction controls the reservoir quality as a whole,the large thickness of sand body is more favorable for the preservation of reservoir space,thus forming high quality reservoirs,the calcitic cementation is relatively developed at the top and bottom of single sand body,and the thickness of calcite cemented sandstone has a good relationship with the thickness of adjacent mudstone barrier/interbed; the carbon and oxygen isotopes of sandstone and adjacent mudstone indicate that the compaction and drainage of mudstone are the main cause of calcitic cementation. This study establishes the relationship between different types of sedimentary frameworks and reservoir quality,clarifies the mechanism of reservoir quality controlled by sedimentary framework,and lays a foundation for optimal selection of favorable areas under the condition of few wells.
The relationship between sedimentary framework and reservoir quality is less studied. In the paper,the core,well logging and geochemical analysis data were used to sudy the relationship between sedimentary framework and reservoir quality of Chang_8~1 and Chang_8~2 sublayers in Zhenjing area. The study results show that the sedimentary framework of Chang_8~1 and Chang_8~2 sublayers can be divided into 3 types like single layer type,sandwich-type and interbed-type based on the developmental state of single sand body and effective mudstone barrier/interbed;the interval with good reservoir quality is mostly located in the middle of single sand body; the thickness of single sand body is positively correlated with the thickness and physical properties of interval with good reservoir quality,and when the thickness of single sand body is less than 7 m,the interval with good reservoir quality is basically not developed; the compaction and calcitic cementation are the main mechanisms for the reservoir quality to be controlled by sedimentary framework,the compaction controls the reservoir quality as a whole,the large thickness of sand body is more favorable for the preservation of reservoir space,thus forming high quality reservoirs,the calcitic cementation is relatively developed at the top and bottom of single sand body,and the thickness of calcite cemented sandstone has a good relationship with the thickness of adjacent mudstone barrier/interbed; the carbon and oxygen isotopes of sandstone and adjacent mudstone indicate that the compaction and drainage of mudstone are the main cause of calcitic cementation. This study establishes the relationship between different types of sedimentary frameworks and reservoir quality,clarifies the mechanism of reservoir quality controlled by sedimentary framework,and lays a foundation for optimal selection of favorable areas under the condition of few wells.
引文
[1]黄思静,谢连文,张萌,等.中国三叠系陆相砂岩中自生绿泥石的形成机制及其与储层孔隙保存的关系[J].成都理工大学学报(自然科学版),2004,31(3):273-281.
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[9]袁珍,李文厚.鄂尔多斯盆地东南缘上三叠统延长组砂岩方解石胶结物成因[J].吉林大学学报(地球科学版),2011,41(增刊1):17-23.
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[11]周晓峰,李书恒,宋鹏,等.鄂尔多斯盆地西南部长8砂岩中方解石胶结物表面绿泥石膜的形成机制[J].西安石油大学学报(自然科学版),2017,32(3):34-43.
[12]付晶,吴胜和,付金华,等.鄂尔多斯盆地陇东地区延长组储层定量成岩相研究[J].地学前缘,2013,20(2):86-97.
[13]付晶,吴胜和,罗安湘,等.鄂尔多斯盆地陇东地区延长组纵向储层质量差异及主控因素分析[J].地学前缘,2013,20(2):98-107.
[14]郭旭升,李宇平,刘若冰,等.四川盆地焦石坝地区龙马溪组页岩微观孔隙结构特征及其控制因素[J].天然气工业,2014,34(6):9-16.
[15]杨希濮,孙卫.鄂尔多斯盆地低渗透油藏孔隙结构特征及影响因素分析[J].特种油气藏,2011,18(6):44-47.
[16]王瑞飞,陈明强,孙卫.鄂尔多斯盆地延长组超低渗透砂岩储层微观孔隙结构特征研究[J].地质论评,2008,54(2):270-277.
[17]尤源,牛小兵,辛红刚,等.国外致密油储层微观孔隙结构研究及其对鄂尔多斯盆地的启示[J].石油科技论坛,2013,32(1):12-18.
[18]公言杰,柳少波,朱如凯,等.致密油流动孔隙度下限———高压压汞技术在松辽盆地南部白垩系泉四段的应用[J].石油勘探与开发,2015,42(5):681-688.
[2]黄文彪,卢双舫,邓守伟,等.松辽盆地南部泉四段致密砂岩成岩作用及微—纳米储集空间演化[J].中国石油大学学报(自然科学版),2018,42(1):11-20.
[3]兰叶芳,黄思静,吕杰.储层砂岩中自生绿泥石对孔隙结构的影响———来自鄂尔多斯盆地上三叠统延长组的研究结果[J].地质通报,2011,31(1):134-140.
[4]张莉,谭兴奎.杨米涧—大路沟地区长6储层特征及其控制因素[J].重庆科技学院学报(自然科学版),2014,16(6):32-35.
[5]屈雪峰,周晓峰,刘丽丽,等.鄂尔多斯盆地古峰庄—麻黄山地区长82低渗透砂岩致密化过程分析[J].天然气地球科学,2018,29(3):337-348.
[6]张哨楠,丁晓琪.鄂尔多斯盆地南部延长组致密砂岩储层特征及其成因[J].成都理工大学学报(自然科学版),2010,37(4):386-394.
[7]张哨楠,丁晓琪,万友利,等.致密碎屑岩中黏土矿物的形成机理与分布规律[J].西南石油大学学报(自然科学版),2012,34(3):174-182.
[8]赵新智.鄂尔多斯盆地陇东地区低渗透储层特征及分级评价[D].北京:中国地质大学,2012.
[9]袁珍,李文厚.鄂尔多斯盆地东南缘上三叠统延长组砂岩方解石胶结物成因[J].吉林大学学报(地球科学版),2011,41(增刊1):17-23.
[10]张莹莹,黄思静.华庆地区长6油层组方解石胶结物特征[J].岩性油气藏,2012,24(2):48-52.
[11]周晓峰,李书恒,宋鹏,等.鄂尔多斯盆地西南部长8砂岩中方解石胶结物表面绿泥石膜的形成机制[J].西安石油大学学报(自然科学版),2017,32(3):34-43.
[12]付晶,吴胜和,付金华,等.鄂尔多斯盆地陇东地区延长组储层定量成岩相研究[J].地学前缘,2013,20(2):86-97.
[13]付晶,吴胜和,罗安湘,等.鄂尔多斯盆地陇东地区延长组纵向储层质量差异及主控因素分析[J].地学前缘,2013,20(2):98-107.
[14]郭旭升,李宇平,刘若冰,等.四川盆地焦石坝地区龙马溪组页岩微观孔隙结构特征及其控制因素[J].天然气工业,2014,34(6):9-16.
[15]杨希濮,孙卫.鄂尔多斯盆地低渗透油藏孔隙结构特征及影响因素分析[J].特种油气藏,2011,18(6):44-47.
[16]王瑞飞,陈明强,孙卫.鄂尔多斯盆地延长组超低渗透砂岩储层微观孔隙结构特征研究[J].地质论评,2008,54(2):270-277.
[17]尤源,牛小兵,辛红刚,等.国外致密油储层微观孔隙结构研究及其对鄂尔多斯盆地的启示[J].石油科技论坛,2013,32(1):12-18.
[18]公言杰,柳少波,朱如凯,等.致密油流动孔隙度下限———高压压汞技术在松辽盆地南部白垩系泉四段的应用[J].石油勘探与开发,2015,42(5):681-688.
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