李家城则区长6致密砂岩成岩作用与影响因素
|
摘要
综合应用铸体薄片、扫描电镜、荧光薄片、阴极发光及黏土矿物X衍射等技术,研究了靖边油田李家城则区长6致密砂岩成岩作用及影响因素。结果表明:长6储层胶结物成分主要为方解石、绿泥石和浊沸石;孔隙类型以残余粒间孔和各种溶蚀孔隙为主,平均孔隙直径为40～100μm。影响储层物性的因素主要与沉积相和成岩作用有关,不同沉积相带储层物性具有显著的差异,尤以水下分流河道微相储层物性最好。压实作用是破坏储层物性的第一要素,其孔隙减小率平均为56.3%;胶结作用使储层进一步致密化,其平均孔隙减小率为30.0%;溶蚀作用一定程度改善了储层物性,其平均增孔率约7.3%;宏观及微观裂缝对储层渗透率有显著影响,而对孔隙度影响微弱。
The diagenesis and influencing factors of Chang 6 tight sandstone in Lijiachengze area of Jingbian Oilfield were studied by means of casting, fluorescence, scanning electron microscopy, cathodoluminescence, and X-ray diffraction of clay minerals. The results show that the cements in Chang 6 reservoir are mainly composed of calcite, chlorite and laumontite, and the pore types are mainly residual intergranular pores and various dissolution pores, with an average pore diameter of 40-100 μm. The factors affecting reservoir physical properties are mainly related to sedimentary facies and diagenesis. The physical properties of reservoirs with different sedimentary microfacies and grain size change are obviously different, and the underwater distributary channel microfacies reservoirs have the best physical properties. Compaction is the first factor to destroy reservoir physical properties, with an average porosity reduction rate of 56.3%. Cementation further densifies the reservoir, with an average porosity reduction rate of 30.0%.Dissolution improves reservoir physical properties to a certain extent, with an average porosity increase rate of 7.3%. Macro and micro fractures have a significant impact on reservoir permeability, but have a weak impact on porosity.
The diagenesis and influencing factors of Chang 6 tight sandstone in Lijiachengze area of Jingbian Oilfield were studied by means of casting, fluorescence, scanning electron microscopy, cathodoluminescence, and X-ray diffraction of clay minerals. The results show that the cements in Chang 6 reservoir are mainly composed of calcite, chlorite and laumontite, and the pore types are mainly residual intergranular pores and various dissolution pores, with an average pore diameter of 40-100 μm. The factors affecting reservoir physical properties are mainly related to sedimentary facies and diagenesis. The physical properties of reservoirs with different sedimentary microfacies and grain size change are obviously different, and the underwater distributary channel microfacies reservoirs have the best physical properties. Compaction is the first factor to destroy reservoir physical properties, with an average porosity reduction rate of 56.3%. Cementation further densifies the reservoir, with an average porosity reduction rate of 30.0%.Dissolution improves reservoir physical properties to a certain extent, with an average porosity increase rate of 7.3%. Macro and micro fractures have a significant impact on reservoir permeability, but have a weak impact on porosity.
引文
[1]葛云锦,马芳侠.富县地区长8致密储层微观结构及致密化[J].断块油气田,2018,25(3):300-304.
[2]曹喆,柳广弟,柳庄小雪,等.致密油地质研究现状及展望[J].天然气地球科学,2014,25(10):1499-1508.
[3]白玉彬,赵靖舟,叶小闯.致密油藏与常规油藏物性界限研究方法探讨及其应用[J].西安石油大学学报(自然科学版),2017,32(4):32-38.
[4]郑卉,白玉彬,郝孝荣,等.鄂尔多斯盆地安塞地区长9油层组流体包裹体特征与成藏时间[J].岩性油气藏,2013,25(6):1-5.
[5]罗静兰,罗晓容,白玉彬,等.差异性成岩演化过程对储层致密化时序与孔隙演化的影响[J].地球科学与环境学报,2016,38(1):79-92.
[6]程新虎,柳益群,陈魏巍,等.鄂尔多斯盆地张家山地区长8储集层成岩作用及有利相带[J].新疆石油地质,2012,33(3):316-320.
[7]柳广弟,高先志.石油地质学[M].4版.北京:石油工业出版社,2009:43-48.
[8] HOUSEKNECHT D W. Assessing the relative importance of compaction processes and cementation to reduction of porosity in sandstones[J]. AAPG Bulletin,1987,71(6):633-642.
[9]白玉彬,孙怀智,郝孝荣,等.安塞地区长9致密砂岩储集层成岩作用研究[J].新疆石油地质,2014,35(1):23-28.
[10]任战利.鄂尔多斯盆地热演化史与油气关系的研究[J].石油学报,1996,17(1):17-24.
[11]应凤祥,何东博,龙玉梅,等.碎屑岩成岩阶段划分:SY/T 5477—2003[S].北京:石油工业出版社,2003:50-70.
[12]朱国华.陕北浊沸石次生孔隙砂体的形成与油气关系[J].石油学报,1985,6(1):1-8.
[13] BEARD D C, WEYL P K. Influence of texture on porosity and permeability of unconsolidated sand[J]. AAPG Bulletin,1973,57(2):349-369.
[14]王付斌,尹伟,陈纯芳.鄂尔多斯盆地红河油田长8油层组致密砂岩储层“甜点”成因机制[J].石油实验地质, 2017, 39(4):484-490.
[15]张浩,仲向云,党永潮,等.鄂尔多斯盆地安塞油田长6储层微观孔隙结构[J].断块油气田,2018,25(1):34-38.
[16]邓亚仁,任战利,马文强,等.鄂尔多斯盆地富县地区长8层段致密砂岩储层特征及充注下限[J].石油实验地质,2018,40(2):288-294.
[17]胡圆圆,陈恭洋,胡再元.姬塬-堡子湾地区长6段成岩作用研究[J].断块油气田,2009,16(1):25-27.
[18]张茜,孙卫,杨晓菁,等.致密砂岩储层差异性成岩演化对孔隙度演化定量表征的影响:以鄂尔多斯盆地华庆地区长63储层为例[J].石油实验地质,2017,39(1):126-133.
[19]徐东齐,孙致学,任宇飞,等.基于地质知识库的辫状河致密储层地质建模[J].断块油气田,2018,25(1):57-61.
[20]付明义,贺永红,宋元威,等.直罗油田长6砂岩储层微观孔喉结构特征[J].断块油气田,2014,21(1):83-86.
[21]黎盼,孙卫,闫健,等.鄂尔多斯盆地马岭油田长81储层不同流动单元可动流体赋存特征及其影响因素[J].石油实验地质,2018,40(3):362-371.
[22]王明培,夏东领,伍岳,等.鄂尔多斯盆地红河油田长8致密砂岩储层成岩特征[J].石油实验地质,2018,40(6):786-792.
[23]曾联波,李忠兴,史成恩,等.鄂尔多斯盆地上三叠统延长组特低渗透砂岩储层裂缝特征及成因[J].地质学报,2007,81(2):174-180.
[2]曹喆,柳广弟,柳庄小雪,等.致密油地质研究现状及展望[J].天然气地球科学,2014,25(10):1499-1508.
[3]白玉彬,赵靖舟,叶小闯.致密油藏与常规油藏物性界限研究方法探讨及其应用[J].西安石油大学学报(自然科学版),2017,32(4):32-38.
[4]郑卉,白玉彬,郝孝荣,等.鄂尔多斯盆地安塞地区长9油层组流体包裹体特征与成藏时间[J].岩性油气藏,2013,25(6):1-5.
[5]罗静兰,罗晓容,白玉彬,等.差异性成岩演化过程对储层致密化时序与孔隙演化的影响[J].地球科学与环境学报,2016,38(1):79-92.
[6]程新虎,柳益群,陈魏巍,等.鄂尔多斯盆地张家山地区长8储集层成岩作用及有利相带[J].新疆石油地质,2012,33(3):316-320.
[7]柳广弟,高先志.石油地质学[M].4版.北京:石油工业出版社,2009:43-48.
[8] HOUSEKNECHT D W. Assessing the relative importance of compaction processes and cementation to reduction of porosity in sandstones[J]. AAPG Bulletin,1987,71(6):633-642.
[9]白玉彬,孙怀智,郝孝荣,等.安塞地区长9致密砂岩储集层成岩作用研究[J].新疆石油地质,2014,35(1):23-28.
[10]任战利.鄂尔多斯盆地热演化史与油气关系的研究[J].石油学报,1996,17(1):17-24.
[11]应凤祥,何东博,龙玉梅,等.碎屑岩成岩阶段划分:SY/T 5477—2003[S].北京:石油工业出版社,2003:50-70.
[12]朱国华.陕北浊沸石次生孔隙砂体的形成与油气关系[J].石油学报,1985,6(1):1-8.
[13] BEARD D C, WEYL P K. Influence of texture on porosity and permeability of unconsolidated sand[J]. AAPG Bulletin,1973,57(2):349-369.
[14]王付斌,尹伟,陈纯芳.鄂尔多斯盆地红河油田长8油层组致密砂岩储层“甜点”成因机制[J].石油实验地质, 2017, 39(4):484-490.
[15]张浩,仲向云,党永潮,等.鄂尔多斯盆地安塞油田长6储层微观孔隙结构[J].断块油气田,2018,25(1):34-38.
[16]邓亚仁,任战利,马文强,等.鄂尔多斯盆地富县地区长8层段致密砂岩储层特征及充注下限[J].石油实验地质,2018,40(2):288-294.
[17]胡圆圆,陈恭洋,胡再元.姬塬-堡子湾地区长6段成岩作用研究[J].断块油气田,2009,16(1):25-27.
[18]张茜,孙卫,杨晓菁,等.致密砂岩储层差异性成岩演化对孔隙度演化定量表征的影响:以鄂尔多斯盆地华庆地区长63储层为例[J].石油实验地质,2017,39(1):126-133.
[19]徐东齐,孙致学,任宇飞,等.基于地质知识库的辫状河致密储层地质建模[J].断块油气田,2018,25(1):57-61.
[20]付明义,贺永红,宋元威,等.直罗油田长6砂岩储层微观孔喉结构特征[J].断块油气田,2014,21(1):83-86.
[21]黎盼,孙卫,闫健,等.鄂尔多斯盆地马岭油田长81储层不同流动单元可动流体赋存特征及其影响因素[J].石油实验地质,2018,40(3):362-371.
[22]王明培,夏东领,伍岳,等.鄂尔多斯盆地红河油田长8致密砂岩储层成岩特征[J].石油实验地质,2018,40(6):786-792.
[23]曾联波,李忠兴,史成恩,等.鄂尔多斯盆地上三叠统延长组特低渗透砂岩储层裂缝特征及成因[J].地质学报,2007,81(2):174-180.