Oolitic Shoal Composition and Its Implication of Feixianguan Formation in Yudongzi Section of Erlangmiao, Jiangyou, Sichuan, China
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摘要: 江油二郎庙鱼洞子地区飞仙关组早期发育4期鲕粒滩，分别位于4个准层序组Pss1、Pss2、Pss3和Pss4内部.Pss1由两个准层序Ps1和Ps2组成，Ps2是鲕粒滩主体；滩体发育时，剖面位于稳定鲕粒砂坪边缘靠近深水区，以含鲕粒粉-细晶灰岩和鲕粒灰岩为主，鲕粒直径较小，在0.3~0.8mm之间，下部鲕粒含量在20%左右，往上增加到50%~60%，分选中等，呈圆-次圆状.Pss2由3个准层序Ps1、Ps2和Ps3组成，Ps1上部、Ps2和Ps3共同构成鲕粒滩主体；滩体发育时，剖面位于稳定鲕粒砂坪区，以含豆粒鲕粒灰岩和含鲕粒豆粒灰岩为主，颗粒含量在40%~65%之间，其中鲕粒直径较大，在0.2~1.8mm之间，颗粒分选普遍较差，多呈圆-次圆状.Pss3由两个准层序Ps1和Ps2组成，Ps1和Ps2共同构成鲕粒滩主体；滩体发育时，剖面位于稳定鲕粒砂坪靠近鲕粒滩活动边缘区，以鲕粒灰岩为主，颗粒含量在40%~70%之间，其中鲕粒直径较小，在0.1~0.8mm之间，颗粒分选中等-差，多呈次圆状.Pss4由5个准层序Ps1、Ps2、Ps3、Ps4和Ps5组成，后4个是鲕粒滩主体；滩体发育时，剖面位于鲕粒滩活动边缘区，每个准层序下部为白云质鲕粒灰岩，鲕粒含量在50%~60%之间，直径较小，在0.2~0.8mm之间，分选中等-差，多呈圆状，上部为残余鲕粒云岩，鲕粒含量多在80%以上，直径很小，在0.2~0.5mm之间，分选好，呈圆状.滩体解剖和物性测试发现在鲕粒滩活动边缘区，受较强水动力条件改造的鲕粒滩易于形成优质储层，颗粒含量在55%以上且白云石含量在60%以上的鲕粒滩岩石物性明显较好，其平均孔隙度和渗透率分别可以达到10.94%和0.076×10-3μm2.可见，鲕粒滩活动边缘是潜在的优质储层发育部位，且优质储层形成与原始沉积条件密切相关.Abstract: Four phases of oolitic shoal developed in the inner parasequence set 1, parasequence set 2, parasequence set 3 and parasequence set 4 respectively in the forepart of Feixianguan Formation in Yudongzi section of Erlangmiao, Jiangyou. Parasequence set 1 is composed of parasequence 1 and parasequence 2. The later development at the edge of the stabilized sand flat around area with deep water is the main body of oolitic shoal. It is dominated by ooid-silty-fine limestone and oolitic limestone in which ooids are smaller with the diameter ranging from 0.3mm to 0.8mm, moderate-sorted and rounded-subrounded with the increasing of contents ascending from about 20% to 50%-60%. Parasequence set 2 is composed of parasequence 1, parasequence 2 and parasequence 3. The upside of parasequence 1, parasequence 2 and parasequence 3 are all the main body of oolitic shoal developed at the edge of the stabilized sand flat. They are dominated by pisolitic-oolitic limestone and oolitic-pisolitic limestone in which the contents of grains are 40%-65%. Ooids are bigger with the diameter varying from 0.2mm to 1.8mm, poorly-sorted and rounded-subrounded. Parasequence set 3 is composed of parasequence 1 and parasequence 2. Both of them are the main body of oolitic shoal and developed at the edge of the stabilized sand flat around area with the mobile fringe. They are dominated by oolitic limestone in which the contents of grains are 40%-70%. Ooids are a little smaller with the diameter ranging from 0.1mm to 0.8mm, moderate or poorly-sorted and subrounded. Parasequence set 4 is composed of parasequence 1, parasequence 2, parasequence 3, parasequence 4 and parasequence 5. The last four developed on the mobile fringe are the main body of oolitic shoal. Ooids at the bottom of each parasequence which are dominated by dolomitic-oolitic limestone are small with the diameter ranging from 0.2mm to 0.8mm, moderate or poorly-sorted and well-rounded with the contents of 50%-60%, while those on the top dominated by residual oolitic dolostones are much smaller with the diameter ranging from 0.2mm to 0.5mm, well-sorted and well-rounded with the contents of over 80%. By the analogs of oolitic shoal and testing of physical properties, it is found that high-quality reservoir is developed in the mobile fringe where the hydrodynamic conditions are stronger. The reservoir in which the contents of grains in the oolitic shoal are more than 55% and the contents of dolomite are more than 60% have better physical properties with porosities of 10.94% and permeabilities of 0.076×10-3μm2 on average. Thus it can be seen the mobile fringe is the position where potential high-quality reservoirs develop and the forming of them are highly related with their original sediment conditions.
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Key words:
- sequence stratigraphy /
- oolitic shoal /
- Feixianguan Formation /
- Erlangmiao, Jiangyou /
- Sichuan basin
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图 1 四川盆地下三叠统飞仙关组早期古地理①、鱼洞子剖面交通位置及剖面概况
Fig. 1. Paleogeography of Early Feixianguan in Sichuan basin and traffic location and stata of Yudongzi Section
图 2 江油二郎庙鱼洞子剖面飞仙关组早期鲕粒滩沉积特征(岩性柱状图例见图 1)
Fig. 2. Sedimentary features of oolitic shoal of the Early Feixianguan in Yudongzi Section, Erlangmiao, Jiangyou
图 3 江油二郎庙鱼洞子剖面准层序组Pss1、Pss2和Pss3内部鲕粒滩岩性特征
a.Pss1中Ps1顶部灰质砂屑白云岩，Ya-14，染色岩矿薄片，单偏光，×10；b.Pss1中Ps2上部鲕粒灰岩，鲕粒分选中等，呈次圆-圆状，Ya-20，普通岩矿薄片，单偏光，×1；c.Pss2中Ps1上部含豆粒鲕粒灰岩，其下部颗粒分选中等-差，多呈圆-次圆状，含量低，Ya-24，铸体薄片，单偏光，×1；d.Pss2中Ps1上部含豆粒鲕粒灰岩，其上部颗粒分选中等-差，多呈圆状，含量高，Ya-26，染色岩矿薄片，单偏光，×1；e.Pss2中Ps3下部颗粒分选差，多呈次圆状，含量低，Ya-36，染色岩矿薄片，单偏光，×1；f.右：Pss2中Ps3中部颗粒分选中等，多呈圆状，含量高，Ya-38，染色岩矿薄片，单偏光，×1；g.Pss3中Ps1底部鲕粒个体较小，分选中等-差，多呈圆-次圆状，部分破裂，核心溶蚀，Ya-45，铸体薄片，单偏光，×5；h.Pss3中Ps2上部鲕粒个体很小，分选中等，除部分破碎，核心溶蚀外，多呈圆状，铸体薄片，Ya-64，单偏光，×5
Fig. 3. Lithology of oolitic shoal in the parasequence set 1, parasequence set 2 and parasequence set 3 of Yudongzi Section, Erlangmiao, Jiangyou
图 4 江油二郎庙鱼洞子剖面准层序组Pss4内部鲕粒滩岩性特征
a.Pss4中Ps1中部灰质鲕粒云岩，见亮晶斑块状方解石，顺层分布，鲕粒分选中等，多呈圆状，Ya-77，染色岩矿薄片，正交光+石膏试板，×1；b.Pss4中Ps1上部条带状灰质含鲕粒白云岩，鲕粒顺层分布，分选中等，多呈圆状，Ya-73，染色岩矿薄片，单偏光，×1；c.Pss4中Ps2下部白云质鲕粒灰岩，鲕粒含量低，分选中等-差，多呈圆状，颗粒内部或基质部分白云岩化，Ya-b1，染色岩矿薄片，单偏光，×5；d.Pss4中Ps2上部残余鲕粒云岩，鲕粒含量高，点接触，分选好，呈浑圆状，Ya-b12，染色岩矿薄片，单偏光，×5；e.Pss4中Ps2上部残余鲕粒云岩中的粒间孔隙，分布于鲕粒之间，部分原油充填，Ya-b9，铸体薄片，单偏光，×5；f.Pss4中Ps2上部残余溶孔鲕粒白云岩中的铸模孔隙，鲕粒基本完全溶蚀，内部组构破坏，但形态保存较为完整，部分原油充填，Ya-b4，铸体薄片，单偏光，×5
Fig. 4. Lithology of oolitic shoal in the parasequence set 4 of Yudongzi Section, Erlangmiao, Jiangyou
图 5 江油二郎庙鱼洞子地区飞仙关组早期鲕粒滩沉积模式
Fig. 5. Development model of oolitic shoal in Early Feixianguan, Yudongzi, Erlangmiao, Jiangyou
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