摘要:
钻井揭示庙北地区沙一段储层物性较差,该区是否发育优质储层直接影响着下一步的勘探决策。综合利用壁心、薄片、地震、钻井及分析化验等资料,分析储层特征和影响因素,探讨了优质储层分布,分析表明,庙北地区沙一段为低孔、低渗—特低渗储层,储集空间为粒间溶孔和粒内溶孔。碱性水体条件下的碳酸盐矿物强胶结、扇三角洲边缘相带和黏土矿物向伊利石的转化是导致储层物性差的主要因素,溶蚀作用是控制优质储层发育的决定因素。受沉积相带、溶蚀强度及异常高压等条件控制,同沉积断层下降盘的扇三角洲主河道区和水下隆起带上的碳酸盐岩浅滩为优质储层发育的有利区。研究成果对于该区油气勘探具有重要的参考意义。
Abstract:
The reservoir of sha 1 Member in the Miaobei area has been proven by logging to be a reservoir with poor physical properties. If there is high quality reservoir remains a question in decision making for further exploration. Base on side-cores, thin sections, and seismic, logging and testing data, we made a thorough study on reservoir properties and their influencing factors, and discussed the possible existence of high-quality reservoirs and their distribution in this paper. Data Shows that the reservoir in Sha 1 Member is low in porosity, and low to very low in permeability. The reservoir space is provided mainly by dissolved pores between and/or within grains. Carbonate cementation under alkaline water conditions, facies at the edge of a fan delta and diagenetic transformation of illite in clay minerals are the factors leading to poor reservoir properties. Dissolution is believed the major factor for improvement of reservoir quality. Therefore, reservoirs with better quality may occur in some places with favorable microfacies, strong dissolution and extraordinary high pressure conditions, such as the main channel of fan deltas at the lower wall of a syndepositional fault and carbonate banks at depositional highs.
下载: