川东北元坝-通南巴地区须四段储层物源类型及主控因素分析
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摘要
近期勘探在川东北元坝-通南巴地区须家河组四段获得工业气流,揭示须四段具有良好的勘探前景,但其天然气富集程度差异较大,储层特征及主控因素尚待揭示。本文通过对大量钻井和分析测试资料的深入分析,明确了研究区须四段物源来自龙门山、米仓山和大巴山等多个构造带,研究区须四段可分为富钙屑砂砾岩、富石英砂砾岩和富长石砂岩3种类型储层。认为储层发育明显受到物源、成岩作用和裂缝等因素共同控制:物源体系控制储层岩石类型和空间展布,溶蚀作用改善了储层物性,而裂缝对致密砂岩渗透率的提高具有明显贡献,是该层段天然气高产的的关键因素。元坝东部富长石砂岩和元坝西部富钙屑砂砾岩叠合裂缝发育区是须四段勘探的最有利地区。
The industrial gas flows have been explored recently in the 4th member of the Xujiahe Formation in the Yuanba-Tongnanba area, northeastern Sichuan. Judged from drill cores and thin section examination, the sediments in the 4th member of the Xujiahe Formation may emanate from several structural belts in the Longmen,Micang and Daba Mountain areas. The reservoir rocks contain three types: calcium-rich sandstones and conglomerates,quartz-rich sandstones and conglomerates and feldspar-rich sandstones. The controlling factors include provenance types,diagenesis and fissure development. The types and spatial distribution of the reservoir rocks are constrained by the provenance systems. The dissolution facilitates the improvement of the porosity and permeability of the reservoir rocks. The fissures may contribute to the improvement of the permeability of the dense sandstones. The fissure development in feldspar-rich sandstones in eastern Yuanba and calcium-rich sandstones and conglomerates in western Yuanba is believed to be most favourable exploration conditions in the 4th member of the Xujiahe Formation.
The industrial gas flows have been explored recently in the 4th member of the Xujiahe Formation in the Yuanba-Tongnanba area, northeastern Sichuan. Judged from drill cores and thin section examination, the sediments in the 4th member of the Xujiahe Formation may emanate from several structural belts in the Longmen,Micang and Daba Mountain areas. The reservoir rocks contain three types: calcium-rich sandstones and conglomerates,quartz-rich sandstones and conglomerates and feldspar-rich sandstones. The controlling factors include provenance types,diagenesis and fissure development. The types and spatial distribution of the reservoir rocks are constrained by the provenance systems. The dissolution facilitates the improvement of the porosity and permeability of the reservoir rocks. The fissures may contribute to the improvement of the permeability of the dense sandstones. The fissure development in feldspar-rich sandstones in eastern Yuanba and calcium-rich sandstones and conglomerates in western Yuanba is believed to be most favourable exploration conditions in the 4th member of the Xujiahe Formation.
引文
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[2]陈逵,徐双辉.川东北元坝地区须家河组四段油气储层特征及主控因素[J].中国石油和化工标准与质量,2014,6:213-214.
[3]程陈,刘成川,罗顺社,等.川东北MLB地区须家河组须四段储层特征研究[J].长江大学学报(自然科学版),2011,8(8):24-27.
[4]谢继容,李国辉,唐大海.四川盆地上三叠统须家河组物源供给体系分析[J].天然气勘探与开发,2007,29(4):1-3.
[5]王金琪.安县构造运动[J].石油与天然气地质,1990,11(3):223-234.
[6]罗启后.安县运动对四川盆地中西部上三叠统地层划分对比与油气勘探的意义[J].天然气工业,2011,31(6):21-27.
[7]毛琼,郑荣才,邹光富,等.川东北前陆盆地上三叠统沉积相及沉积演化[J].沉积与特提斯地质,2012,32(1):1-10.
[8]李士祥,胡明毅.川西前陆盆地上三叠统须家河组砂岩成岩作用及孔隙演化[J].天然气地球科学,2007,18(4):535-538.
[9]郭彤楼.四川盆地北部陆相大气田形成与高产主控因素[J].石油勘探与开发,2013,40(2):139-149.
[10]朱抱荃,程中第.地层干酪根有机酸与储层次生孔隙的关系[J].石油实验地质,2007,14(1):206-215.