Interaction between source rock and evaporite:A case study of natural gas generation in the northern Dongying Depression  

作　　者：JIN Qiang WANG Juan SONG Guoqi WANG Li LIN Lamei BAI Shengpin 

机构地区：[1]China University of Petroleum, Huangdao, Shandong 255666, China [2]The Shengli Oilfield Co., SINOPEC, Dongying, Shandong 257001, China [3]The Bohai Drilling Engineering Co., PetroChina, Renqiu, Hebei 062550, China

出　　处：《Chinese Journal Of Geochemistry》2010年第1期75-81,共7页中国地球化学学报

基　　金：prepared under the permission of the authorities of the Shengli Oilfield,and funded by the National Natural Science Foundation of China (No. 40572084);SINOPEC (No. P07008)

摘　　要：It is well known that oil generated from source rocks of saline-lake facies is characteristic of low Pr/Ph ratio and high contents of gammacerane.The authors found that gas generated from the same source rocks was high in benzene and cyclohexane contents and had light carbon isotope compositions.In this study,a series of thermal simulations of gas generations on source rock with/without evaporites(such as carbonate,gypsum,and sodium chlorite,respectively),were conducted.It was found that the gypsum played an important role on the catalyzsis of gas generation in the thermal simulations.Compositions of the gaseous hydrocarbons generated from source rocks with evaporites are very similar to those of natural gases discovered from northern Dongying Depression.Meanwhile,in the thermal simulations,it was found that the carbon isotopic compositions of gaseous hydrocarbons generated from source rocks with evaporites are lighter than those of the gases from source rocks without evaporites.Therefore,it is concluded that natural gases discovered from northern Dongying Depression are the product of interaction between source rocks and evaporites(especially gypsum) of the saline facies.It is well known that oil generated from source rocks of saline-lake facies is characteristic of low Pr/Ph ratio and high contents of gammacerane. The authors found that gas generated from the same source rocks was high in benzene and cyclohexane contents and had light carbon isotope compositions. In this study, a series of thermal simulations of gas generations on source rock with/without evaporites （such as carbonate, gypsum, and sodium chlorite, respectively）, were conducted. It was found that the gypsum played an important role on the catalyzsis of gas generation in the thermal simulations. Compositions of the gaseous hydrocarbons generated from source rocks with evaporites are very similar to those of natural gases discovered from northern Dongying Depression. Meanwhile, in the thermal simulations, it was found that the carbon isotopic compositions of gaseous hydrocarbons generated from source rocks with evaporites are lighter than those of the gases from source rocks without evaporites. Therefore, it is concluded that natural gases discovered from northern Dongying Depression are the product of interaction between source rocks and evaporites （especially gypsum） of the saline facies.

关 键 词：东营凹陷北部 湖相烃源岩 天然气发电 相互作用 蒸发 碳同位素组成 气体打火机 碳氢化合物 

分 类 号：P618.13[天文地球—矿床学] TE112.1[天文地球—地质学]