THE CHARACTERISTICS OF MINERAL COMPONENTS FOR EFFECTIVE SOURCE ROCKS FROM DONGYING DEPRESSION OF BOHAI BAY BASIN AND ITS SIGNIFICANCE
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摘要: 渤海湾盆地东营凹陷有效烃源岩X射线衍射分析结果表明,沙三下和沙四上亚段有效烃源岩主要由石英、长石、粘土(伊利石和伊/蒙混层)和碳酸盐(方解石和白云石)组成,并含少量黄铁矿、膏盐、石盐以及钙芒硝,表明这2套烃源岩沉积于半深湖及深湖相咸化、碱性、强还原水体;伊/蒙混层矿物的混层比可以较真实地反映烃源岩成熟度特征。2套有效烃源岩矿物组成特征与高产页岩气的页岩矿物组成特征相似,富含脆性矿物而低含粘土矿物,有利于产生裂缝,易于被压裂,也有利于页岩气的开采。东营凹陷利津洼陷和民丰洼陷的主洼区,应是页岩气勘探与开发的有利地区。Abstract: The results of X-ray diffraction of effective source rocks in Dongying Depression of the Bohai Bay Basin show that the main mineral components of effective source rocks for Es3(下) and Es4(上) are quartz,feldspar,clay(illite and illite-smectite),carbonate(calcite and dolomite);the minor mineral components are pyrite,gypsum,anhydrite,mineral salt and brongniartine.This suggests that both source rocks are deposited in moderate deep or deep lacustrine facies with brinish,alkalic and strength reduction water body.The percent of smectite in illite-smectite(%S) of effective effective source rocks can quite truly reflect the thermal maturity of source rocks.The characteristics of mineral components for both source rocks are similar to the shale with high production of shale gas,that is rich in brittle minerals and lower in clay mineral.This means both source rocks in Dongying Depression are favorable to form fracture and can be fractured easily,and are also favorable to produce shale gas.The favorable places for prospecting and developing shale gas in Dongying Depression are at the main sag of Lijin and Minfeng.
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