摘要
传统认为渤海湾盆地冀中坳陷束鹿凹陷沙三下亚段是主要烃源岩层系,以生油为主。华北油田的勘探实践发现中深层砾岩—泥灰岩致密储层具有较大的天然气资源潜力,这为渤海湾盆地富油凹陷寻找天然气提供了新领域和新方向。研究发现,束鹿凹陷沙三下亚段发育有砾岩、泥灰岩和(灰质)泥岩等多种岩性,均具有生烃能力,其中纹层状泥灰岩生烃能力最强,主要分布在中部洼槽区层序二—层序三;中深层储层,为特低孔特低渗储层,物性不受埋深控制。束鹿凹陷内纵、横向油气藏性质和分布受控于烃源岩热演化程度,由浅到深形成致密油带、油气共生带、纯气带递次变化的"致密油、气连续成藏序列"。利用体积法和资源丰度类比法预测束鹿凹陷中深层天然气资源量为672.1×10^(8)m^(3),并指出中部洼槽区晋古11井区是中深层天然气勘探的有利现实方向。
The lower third member of Shahejie Formation(Es3)was traditionally considered as the main source rock for oilfields in Shulu Sag,Bohai Bay Basin. The exploration practice of Huabei Oilfield Company showed the middle-deep conglomerate-marl lacustrine carbonate tight reservoirs have great potential of natural gas resources,which provides a new field and direction for exploration of natural gas in the oil-rich Bohai Bay Basin.There are conglomerate,marl and(calcareous)mudstone and other lithology developed in the lower Es3 of Shulu Sag,and all of them have hydrocarbon generation potential,among which the laminar marls have the highest hydrocarbon generation ability and they are mainly distributed in sequences 2 to 3 in the central depression;the middle-deep reservoirs have extremely low porosity and ultra-low permeability,and their physical properties are not controlled by burial depth. The vertical and horizontal distribution of hydrocarbon reservoirs and their fluid properties in the sag are controlled by the thermal evolution degree of hydrocarbon source rock by hydrous pyrolysis experiments and exploration data. There is a successive change from tight oil to tight gas accumulation sequence from shallow to deep,including tight oil belt,oil-gas paragenesis zone and pure gas zone. The volume method and resource abundance analogy method are used to predict the natural gas resources of 672.1×10^(8) m^(3) in Shulu Sag,and it is pointed out that the Jingu 11 well area in the central depression area is a favorable practical direction for the exploration of middle and deep natural gas.
作者
张锐锋
陈柯童
朱洁琼
唐玄
鱼占文
张宇飞
赵旭
江涛
ZHANG Rui-feng;CHEN Ke-tong;ZHU Jie-qiong;TANG Xuan;YU Zhan-wen;ZHANG Yu-fei;ZHAO Xu;JIANG Tao(PetroChina Huabei Oilfield Company,Renqiu 062552,China;Exploration and Development Research Institute,PetroChina Huabei Oilfield Company,Renqiu 062552,China;Exploration and Development Research Center of PetroChina Southern Petroleum Exploration and Development Co.Ltd.,Haikou 570216,China;Key Laboratory of Shale Gas Exploration and Evaluation,Ministry of Land and Resources,China University of Geosciences,Beijing 100083,China)
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2021年第5期623-632,共10页
Natural Gas Geoscience
基金
国家科技重大专项“冀中坳陷增储领域地质评价与勘探实践”(编号:2016ZX05006-005-003)
中国石油科技创新基金项目“湖相碳酸盐岩富有机质层内油气运移与可动性研究”(编号:2016D-5007-0106)
国家科技重大专项“华北探区致密油资源潜力、甜点区预测与关键技术应用”(编号:2016ZX05046-006-007)联合资助.
