四川盆地洛带气田蓬莱镇组气藏储层特征研究

Studyon Characteristics of Reservoirs from Penglaizhen Formation on Luodai Gasfield

洛带气田蓬莱镇组属于浅水三角洲沉积,储层主要储集空间以粒间孔为主,其次是粒内溶孔、晶间孔,岩石中裂缝、微裂缝极少发育,属孔隙型储层。储层主要储集空间以粒间孔为主,其次是粒内溶孔、晶间孔,岩石中裂缝、微裂缝极少发育,属孔隙型储层。储层受压实、胶结作用的影响较大,使得其储层物性有所变差。孔隙度在10%~13%的储层与孔隙度大于13%的储层比例相当,其次为孔隙度在6%~10%之间的储层。溶蚀作用是该区储层最重要的成岩作用之一,溶蚀作用产生的次生孔隙可以极大改善储层因受到压实、方解石的胶结作用等导致的孔隙性破坏,研究区内常常可以见到次生孔隙特别发育等多期溶蚀的证据。从储层的成岩及后生改造作用可以看出,以胶结作用为主的成岩后生作用影响最为显著,只有溶解作用和交代作用对孔喉有一定的改善作用。

The Penglaizhen Formation in the Luodai Gas Field is a shallow-water delta deposit.The mainly storage space of the reservoir is intergranular pores,followed by intragranular dissolved pores and intercrystalline pores.There are very few fractures and microfractures in the rock.The reservoir is greatly affected by compaction and cementation,which makes its physical properties worse.Reservoirs with porosity between 10%and 13%are equivalent to those with porosity greater than 13%,followed by reservoirs with porosity between 6%and 10%.DissolutionEffect is one of the most important diagenesis in the reservoir.The secondary pores produced by dissolution can hugely improve the porosity damage caused by compaction,cementation of calcite,etc.Evidence of multi-stage dissolution such as the development of secondary pores.It can be seen from the diagenesis and metagenetic transformation of the reservoir that the diagenetic metagenesis mainly based on cementation has the most significant impact,and only the dissolution and metasomatism have a certain improvement effect on the pore throat.