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川西龙门山地区中泥盆统观雾山组油气勘探获得突破,但对储集层尚无系统研究。通过野外露头、岩心、薄片、阴极发光资料,结合岩石物性分析,对龙门山地区观雾山组储集层特征、控制因素和储集层演化过程进行深入研究。结果表明,观雾山组储集层岩性主要为砾屑白云岩、生物白云岩、生物碎屑白云岩和晶粒白云岩,储集空间以残余粒内溶孔、晶间溶孔、大型溶孔为主,构造裂缝发育,平均孔隙度约为2.85%,储集层主要为礁滩体白云岩裂缝—孔洞型储集层。储集层形成受礁滩体、白云石化作用和溶蚀作用控制,礁滩体是储集层发育的地质基础,白云石化作用是储集层发育的必要条件,溶蚀作用是储集层发育的关键因素,构造作用推动储集层最终形成。储集层经历了3个演化阶段,沉积、白云石化及溶蚀作用奠定了储集空间类型,构造作用改善储集层物性,沥青充填使储集层物性变差。基于储集层主控因素,预测剑阁—江油—绵阳地区古地貌高点的白云岩礁滩体是有利储集层发育区,油气勘探有望取得新突破。
A breakthrough has been made in the exploration of the Middle Devonian Mt.Gunshan Formation in the Longmenshan area of western Sichuan, but there is no systematic study of the reservoir. Based on the field outcrops, core, thin slices and cathodoluminescence data, combined with the petrophysical property analysis, the reservoir characteristics, controlling factors and reservoir evolution of the Guanwunshan Formation in the Longmenshan area are studied in depth. The results show that the lithology of the Qianguenshan Formation is mainly composed of gravel dolomite, bio-dolomite, bioclastic dolomite and crystalline dolomite. The reservoir space is characterized by residual intragranular dissolved pores, intergranular dissolved pores, large The dissolved pores are dominant and tectonic fractures developed with an average porosity of about 2.85%. The reservoirs are mainly fractured-hole type reservoirs in the reef-bank dolomite. The formation of reservoirs is controlled by reef banks, dolomitization and dissolution. The reef banks are the geological basis for the development of reservoirs. Dolomitization is a necessary condition for the development of reservoirs, and dissolution is the key factor in the development of reservoirs , Tectonic action to promote the final formation of the reservoir. The reservoir has undergone three stages of evolution. Sedimentary, dolomitization and dissolution have established the type of reservoir space. The tectonic effect improves reservoir physical properties. Asphaltene filling deteriorates reservoir physical properties. Based on the main reservoir controlling factors, it is expected that the dolomite reef body in the Jiange-Jiangyou-Mianyang area will be a favorable reservoir development area, and oil and gas exploration is expected to make new breakthroughs.