川东北普光地区茅口组白云岩发育特征
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摘要
近年来,在川东北普光地区中二叠统茅口组白云岩储层中发现了良好的气显示,揭示了新的勘探领域。基于钻井岩心、薄片等研究认为:川东北普光地区茅口组白云岩类型主要为灰质(含灰)粉—细晶白云岩,局部见灰质(含灰)砂屑白云岩,偶见粗晶白云岩;粉—细晶白云石多呈半自形—自形晶,残余粒间孔、晶间孔缝发育。纵向上,研究区内茅口组白云岩主要发育在茅二段(明1井最厚,达18.1 m,一般钻井厚度10 m左右)和茅一段顶部,茅三段白云岩厚度较薄。横向上个别层段白云岩分布可对比,但整体可对比性较差;平面上,茅口组白云岩主要分布于双石庙构造和东岳寨构造,其次是东南方向的清溪场构造和宣汉东构造。研究区内茅口组白云岩分布与沉积作用及断裂系统均有一定联系,在台内滩与北东向、北西向2组断裂叠合的部位,白云岩相对更发育。
Dolomite reservoir of the Permian Maokou Formation is a new realm for gas exploration in Puguang area,northeastern Sichuan Basin. Based on well cores and thin sections, it is shown that there mainly developed limy finegrained dolomite, and locally sandy dolomite and coarse-grained dolomite, and the fine-grained dolomite is mostly semi-automorphic or automorphic with residual intergranular pore or fractures. Vertically, dolomite mainly developed at Maokou Member-2 and the top of Maokou Member-1. The total dolomite thickness of Maokou Member-2 in well Ming-1 is 18.1 m, which is higher than the average about 10 m. Horizontally, the dolomites mainly distributed in Shuangshimiao anticline and Dongyuezhai anticline, following by Qingxichang anticline and Xuanhandong anticline.Affected by both sedimentation and fracture system, it is concluded that the dolomite mainly developed at the shoal of inner platform where two sets of faults with different strike(NE, NW) crossed. This study would be helpful for the next gas exploration of Maokou Formation in Puguang area.
Dolomite reservoir of the Permian Maokou Formation is a new realm for gas exploration in Puguang area,northeastern Sichuan Basin. Based on well cores and thin sections, it is shown that there mainly developed limy finegrained dolomite, and locally sandy dolomite and coarse-grained dolomite, and the fine-grained dolomite is mostly semi-automorphic or automorphic with residual intergranular pore or fractures. Vertically, dolomite mainly developed at Maokou Member-2 and the top of Maokou Member-1. The total dolomite thickness of Maokou Member-2 in well Ming-1 is 18.1 m, which is higher than the average about 10 m. Horizontally, the dolomites mainly distributed in Shuangshimiao anticline and Dongyuezhai anticline, following by Qingxichang anticline and Xuanhandong anticline.Affected by both sedimentation and fracture system, it is concluded that the dolomite mainly developed at the shoal of inner platform where two sets of faults with different strike(NE, NW) crossed. This study would be helpful for the next gas exploration of Maokou Formation in Puguang area.
引文
[1]陈轩,赵宗举,高阳,等.四川盆地北部中二叠统茅口组碳酸盐岩斜坡沉积及其油气勘探意义[J].海相油气地质,2013,18(4):9-14.
[2]宋晓波,隆柯,王琼仙,等.四川盆地西部中二叠统茅口组油气地质条件及勘探潜力[J].海相油气地质,2016,21(1):1-6.
[3]沈平,张健,宋家荣,等.四川盆地中二叠统天然气勘探新突破的意义及有利勘探方向[J].天然气工业,2015,35(7):1-8.
[4]刘宏,马腾,谭秀成,等.表生岩溶系统中浅埋藏构造-热液白云岩成因:以四川盆地中部中二叠统茅口组为例[J].石油勘探与开发,2016,43(6):916-927.
[5]李毅,沈浩,石学文,等.川东—川中地区茅口组白云岩成因初探及“热次盆”概念的提出[J].天然气勘探与开发,2013,36(4):1-3.
[6]唐雪松,谭秀成,刘宏,等.四川盆地东部中二叠统茅口组白云岩及云质硅岩储层特征与发育规律[J].石油与天然气地质,2016,37(5):731-743.
[7]管宏林,蒋小琼,王恕一,等.普光气田与建南气田长兴组、飞仙关组储层对比研究[J].石油实验地质,2010,32(2):130-135.
[8]张君龙,汪爱云,何香香.古城地区碳酸盐岩岩性及微相测井识别方法[J].石油钻探技术,2016,44(3):121-126.
[9]刘建强,郑浩夫,刘波,等.川中地区中二叠统茅口组白云岩特征及成因机理[J].石油学报,2017,38(4):386-398.
[10]邓兴梁,乔占峰,王彭,等.埋藏期“断溶体”的储集特征、成因及发育规律:以塔中十号带奥陶系良里塔格组岩溶储层为例[J].海相油气地质,2018,23(1):47-55.
[11]邓国振.普光地区茅口组古地貌恢复及储层预测[R].濮阳:中原油田分公司物探研究院,2017.
[2]宋晓波,隆柯,王琼仙,等.四川盆地西部中二叠统茅口组油气地质条件及勘探潜力[J].海相油气地质,2016,21(1):1-6.
[3]沈平,张健,宋家荣,等.四川盆地中二叠统天然气勘探新突破的意义及有利勘探方向[J].天然气工业,2015,35(7):1-8.
[4]刘宏,马腾,谭秀成,等.表生岩溶系统中浅埋藏构造-热液白云岩成因:以四川盆地中部中二叠统茅口组为例[J].石油勘探与开发,2016,43(6):916-927.
[5]李毅,沈浩,石学文,等.川东—川中地区茅口组白云岩成因初探及“热次盆”概念的提出[J].天然气勘探与开发,2013,36(4):1-3.
[6]唐雪松,谭秀成,刘宏,等.四川盆地东部中二叠统茅口组白云岩及云质硅岩储层特征与发育规律[J].石油与天然气地质,2016,37(5):731-743.
[7]管宏林,蒋小琼,王恕一,等.普光气田与建南气田长兴组、飞仙关组储层对比研究[J].石油实验地质,2010,32(2):130-135.
[8]张君龙,汪爱云,何香香.古城地区碳酸盐岩岩性及微相测井识别方法[J].石油钻探技术,2016,44(3):121-126.
[9]刘建强,郑浩夫,刘波,等.川中地区中二叠统茅口组白云岩特征及成因机理[J].石油学报,2017,38(4):386-398.
[10]邓兴梁,乔占峰,王彭,等.埋藏期“断溶体”的储集特征、成因及发育规律:以塔中十号带奥陶系良里塔格组岩溶储层为例[J].海相油气地质,2018,23(1):47-55.
[11]邓国振.普光地区茅口组古地貌恢复及储层预测[R].濮阳:中原油田分公司物探研究院,2017.