西湖凹陷某构造低渗储层成岩演化研究
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摘要
使用西湖凹陷某构造的常规岩石薄片、铸体薄片、扫描电镜及储层物性分析资料,利用视压实率、视胶结率和视溶蚀率等参数,定量研究了西湖凹陷某构造低渗储层成岩演化序列及孔隙演化过程。研究结果表明:(1)研究区低渗储层孔隙类型以次生溶蚀孔隙为主,粒间溶蚀孔是最主要的次生孔隙类型。(2)机械压实作用是储层低渗的主要因素,导致原始孔隙度损失达65%,溶蚀作用产生的次生溶蚀孔隙一定程度上使储层物性变好。(3)研究区处于中成岩阶段A2期和中成岩阶段B期,成岩演化序列为:(1)脆性颗粒破碎,塑性颗粒变形,局部绿泥石衬边胶结;(2)部分长石及岩屑早期溶解,早期石英次生加大;(3)碳酸盐胶结并交代石英、长石等,石英颗粒发生溶蚀作用;(4)碳酸盐、长石、岩屑等矿物溶蚀形成次生孔隙,石英次生加大;(5)晚期铁方解石少量胶结、交代。该研究成果可为西湖凹陷低渗气藏优质储层的预测与评价提供科学依据。
By using conventional rock thin sections,casting thin sections,scanning electron microscope and reservoir physical property analyses,combined with parameters such as apparent compaction rate,apparent cementation rate and apparent dissolution rate,this paper quantitatively researched the diagenesis sequence and pore evolution process of low permeability reservoir of one structure in Xihu Sag. The research results show that.( 1) The predominant pore types of low permeability reservoir in Xihu Sag are secondary dissolution pores,and intergranular dissolution pore is the main type of secondary porosity.( 2) Mechanical compaction effect is the main factor for low permeability,which results in 65% of primary porosity loss,and the dissolution of the secondary dissolution pores improves the reservoir property to some extent.( 3) The reservoirs in the research area are at stage A2 of middle diagenesis phase and stage B of middle diagenesis phase. The diagenetic evolution sequence is as follows:(1)Brittle particles were broken with the plastic deformation of particles,and local chlorites were edge-cemented;(2)Parts of the feldspar and lithic were dissolved in early period,and quartzs of early period were with secondary overgrowth;(3)Carbonates were cemented and replaced by quartz,feldspar and so on,and quartz particles were dissolved;(4)The dissolution of carbonate,feldspar and cuttings resulted in secondary pores and secondary overgrowth of quartz;(5)Small quantities of iron calcite had cementation and metasomatism. The results can provide scientific basis for the prediction and evaluation of high quality reservoirs in low permeability reservoirs in Xihu Sag.
By using conventional rock thin sections,casting thin sections,scanning electron microscope and reservoir physical property analyses,combined with parameters such as apparent compaction rate,apparent cementation rate and apparent dissolution rate,this paper quantitatively researched the diagenesis sequence and pore evolution process of low permeability reservoir of one structure in Xihu Sag. The research results show that.( 1) The predominant pore types of low permeability reservoir in Xihu Sag are secondary dissolution pores,and intergranular dissolution pore is the main type of secondary porosity.( 2) Mechanical compaction effect is the main factor for low permeability,which results in 65% of primary porosity loss,and the dissolution of the secondary dissolution pores improves the reservoir property to some extent.( 3) The reservoirs in the research area are at stage A2 of middle diagenesis phase and stage B of middle diagenesis phase. The diagenetic evolution sequence is as follows:(1)Brittle particles were broken with the plastic deformation of particles,and local chlorites were edge-cemented;(2)Parts of the feldspar and lithic were dissolved in early period,and quartzs of early period were with secondary overgrowth;(3)Carbonates were cemented and replaced by quartz,feldspar and so on,and quartz particles were dissolved;(4)The dissolution of carbonate,feldspar and cuttings resulted in secondary pores and secondary overgrowth of quartz;(5)Small quantities of iron calcite had cementation and metasomatism. The results can provide scientific basis for the prediction and evaluation of high quality reservoirs in low permeability reservoirs in Xihu Sag.
引文
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[7]吴陈冰洁,朱筱敏,魏巍,等.查干凹陷下白垩统巴二段储层特征及孔隙演化[J].岩性油气藏,2017,29(1):71-80.
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[10]王允诚.油气储层地质学[M].北京:地质出版社,2008.
[11]王瑞飞,沈平平,赵良金.深层储集层成岩作用及孔隙度演化定量模型——以东濮凹陷文东油田沙三段储集层为例[J].石油勘探与开发,2011,38(5):552-559.
[12]胡浩,路遥,唐群英,等.川东北地区须家河组储层成岩作用对孔隙演化影响的定量研究[J].岩性油气藏,2014,26(4):103-109.
[13]葛家旺,朱筱敏,潘荣,等.珠江口盆地惠州凹陷文昌组砂岩孔隙定量演化模式——以HZ-A地区辫状河三角洲储层为例[J].沉积学报,2015,33(1):183-193.
[14]Beard D C,Weyl P K.Influence of texture on porosity and permeability of unconsolidated sand[J].AAPG Bulletin,1973,57(2):349-369.
[15]张自力,李勇,张威,等.歧口凹陷沙三段成岩作用对储层物性贡献率研究[J].地质学刊,2011,35(4):354-357.
[16]国家经济贸易委员会.SY/T 5477—2003《碎屑岩成岩阶段划分规范》[S].北京:石油出版社,2003.
[2]刘金水,唐健程.西湖凹陷低渗储层微观孔隙结构与渗流特征及其地质意义——以HY构造花港组为例[J].中国海上油气,2013,25(2):18-23.
[3]彭己君,张金川,唐玄,等.低渗透背景下西湖凹陷致密砂岩气藏的成藏条件[J].地质科技情报,2015,34(3):107-111.
[4]李杪,罗静兰,赵会涛,等.不同岩性的成岩演化对致密砂岩储层储集性能的影响——以鄂尔多斯盆地东部上古生界盒8段天然气储层为例[J].西北大学学报(自然科学版),2015,45(1):97-106.
[5]黄兴文,胡孝林,郭允,等.加蓬盆地盐岩特征及其对盐下油气勘探的影响[J].中国地质调查,2015,2(3):40-48.
[6]郭佳,牛博.古流体研究的无机地球化学方法综述[J].中国地质调查,2017,4(1):45-49.
[7]吴陈冰洁,朱筱敏,魏巍,等.查干凹陷下白垩统巴二段储层特征及孔隙演化[J].岩性油气藏,2017,29(1):71-80.
[8]于兴河.碎屑岩系油气储层沉积学[M].北京:石油工业出版社,2002.
[9]姜在兴.沉积学[M].北京:石油工业出版社,2003.
[10]王允诚.油气储层地质学[M].北京:地质出版社,2008.
[11]王瑞飞,沈平平,赵良金.深层储集层成岩作用及孔隙度演化定量模型——以东濮凹陷文东油田沙三段储集层为例[J].石油勘探与开发,2011,38(5):552-559.
[12]胡浩,路遥,唐群英,等.川东北地区须家河组储层成岩作用对孔隙演化影响的定量研究[J].岩性油气藏,2014,26(4):103-109.
[13]葛家旺,朱筱敏,潘荣,等.珠江口盆地惠州凹陷文昌组砂岩孔隙定量演化模式——以HZ-A地区辫状河三角洲储层为例[J].沉积学报,2015,33(1):183-193.
[14]Beard D C,Weyl P K.Influence of texture on porosity and permeability of unconsolidated sand[J].AAPG Bulletin,1973,57(2):349-369.
[15]张自力,李勇,张威,等.歧口凹陷沙三段成岩作用对储层物性贡献率研究[J].地质学刊,2011,35(4):354-357.
[16]国家经济贸易委员会.SY/T 5477—2003《碎屑岩成岩阶段划分规范》[S].北京:石油出版社,2003.