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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.
There are four oolitic beaches in Feixianguan Formation of Erhuguan Formation in Jiangyou Erlang, Jiangyou, respectively, which are located in four quasi-sequence groups Pss1, Pss2, Pss3 and Pss4, respectively, Pss1 is composed of two quasi-sequence Ps1 and Ps2, Ps2 is oolitic The main part of the beach is the beach body. When the beach body is developed, the profile is located at the margin of the stable oolitic sand floor close to the deepwater zone. The oolitic grain is dominated by oolitic grain-finely crystalline limestone and oolitic limestone. , The lower part of the ooids is about 20%, increasing up to 50% ~ 60%, sorting medium, round - round shape.Pss2 consists of three quasi-sequence Ps1, Ps2 and Ps3, Ps1 upper part, Ps2 and Ps3 together constitute the main body of oolitic beach. In the development of the beach body, the profile is located in the stable oolitic sand zone, with bean-grain oolitic limestone and oolitic bean-grain limestone with particle content of 40% -65% Among them, oolitic diameter is larger, between 0.2 ~ 1.8mm, the particle sorting is generally poor, mostly round - round shape.Pss3 by two quasi-sequence Ps1 and Ps2, Ps1 and Ps2 together constitute oolong The main part of the beach is the beach body. When the beach body is developed, the profile is located at the stable oolitic sands near the active marginal zone of oolitic beach. The oolitic limestone is the main part with a particle content of 40% -70% Between 0.1 ~ 0.8mm Ps4 is composed of five quasi-sequence Ps1, Ps2, Ps3, Ps4 and Ps5, and the latter four are oolitic beach bodies. In the development of the beach body, the profiles are located in the ooids The marginal zone of the mudflat activity is dolomitic oolitic limestone in the lower part of each quasi-sequence. The oolitic content is between 50% and 60%, and the diameter is relatively small, ranging from 0.2 mm to 0.8 mm. Round, the upper part of the residual oolitic dolomite, oolitic content more than 80%, diameter is small, between 0.2 ~ 0.5mm, sorting well, was round. Beach body anatomy and physical properties found in oolitic Oolitic beaches modified by strong hydrodynamic conditions are easy to form high quality reservoirs, and the oolitic beach with 55% or more dolomite content and more than 60% dolomite have significantly better physical properties. The average pore volume Degree and permeability can reach 10.94% and 0.076 × 10-3μm2, respectively.It can be seen that the active edge of oolitic beach is a potential high-quality reservoir development site, and the formation of high-quality reservoir is closely related to the original sedimentary conditions.