【摘要】：基于普通薄片、鑄體染色薄片、陰極發(fā)光薄片及巖心樣品等資料,采用顯微鏡、掃描電鏡、陰極發(fā)光、地球化學(xué)測試等分析手段,對渤海海域石臼坨凸起東傾末端中深層沙河街組混積巖儲層進行了研究。研究發(fā)現(xiàn),可依據(jù)混積比例差異,將混積巖儲層劃分為Ⅰ、Ⅱ、Ⅲ等3大類;儲集空間以殘余原生粒間孔、生物體腔孔、次生溶蝕孔隙為主;優(yōu)質(zhì)儲層的發(fā)育機制主要受原始混積組分及早期白云石膠結(jié)物含量、成巖作用、沉積微相、油氣充注等4個因素控制。Ⅰ類混積巖儲層形成于生屑灘、砂屑灘與鮞粒灘等高能沉積環(huán)境,儲層特征表現(xiàn)為生物軟體腐爛形成大量生物體腔孔;早期高比例白云石膠結(jié)物削弱了壓實作用對原生孔隙的破壞,油氣充注有效抑制早-中成巖期的的膠結(jié)作用,為原生型優(yōu)質(zhì)儲層的形成提供了條件。Ⅱ、Ⅲ類混積巖沉積于水下分流河道、云坪和陸源碎屑灘的較高能沉積環(huán)境,儲層特征表現(xiàn)為既有較少的生物體腐爛形成的原生孔隙,也有大量長石溶蝕形成的次生孔隙;有機酸對大量地長石的溶蝕對儲層儲集性能的改善是次生型優(yōu)質(zhì)儲層發(fā)育的機制。
[Abstract]:Based on the data of ordinary sheet, cast dyed sheet, cathodoluminescence sheet and core sample, and by means of microscope, scanning electron microscope, cathodoluminescence, geochemical test, etc. The mixed rock reservoir of middle and deep Shahejie formation of Shijiutuo uplift eastward dipping in Bohai Sea is studied in this paper. It is found that the mixed rock reservoirs can be divided into three categories according to the difference of mixing ratio, such as 鈪，

本文編號：2448159