Minfeng sub-sag in the Bohai Bay Basin was taken as an example.The Wells Yanxie 233,Yongxie 932 and Yan 22 were selected for on-site carbon isotope detection.Then,based on sufficient carbon isotope datawhich were acqu...Minfeng sub-sag in the Bohai Bay Basin was taken as an example.The Wells Yanxie 233,Yongxie 932 and Yan 22 were selected for on-site carbon isotope detection.Then,based on sufficient carbon isotope datawhich were acquired on the drilling site using the brand-new carbon isotopic measuring instrument,the carbon i sotope dataand composition data of natural gas produced in this areawerecompared.Andcombined with the evolution of source rocks,the geochemical characteristics of crude oil,the depositional environment of reservoirs and the physical properties,single-well charging characteristics and regional charging area ofnatural gas wereanalyzed.Finally,the feasibility of on-sitecarbon isotope detection method to discriminate hydrocarbon charging was discussed.And the following research results were obtained.First,deep hy drocarbon charging happened in thePurely Purely Lower Sha 4 Member in Well Yanxie 233,and its natural gas is the mixture of the oil cracking gas of deep layers and the thernal cracking gas of autochthonous source rocks.Second,the natural gas in the third and fourth Members ofShahejieFormation in Well Yongxie 932 is the thermale racking gas of autochthonous source rocks,but deep gas charging occurred in particularhole sections.Third,the carbon isotope of associated gas in Well block Yan 22 is high in the central area and low in both sides and high in the south and low in the north,which is accordant with the distributi on characteristics ofreservoir physicalproperties,indicating thatthe charging ofhigh-maturity natural gas is under the control of reservoir physical properties.Fourth,the oil in Well block Yan 22 is the product of autochthonous source rocks in the mature stage while the natural gas is the autochthonous oil-associated gas combined with the charging of deep high-maturity product.It is concluded that there is a high-maturity hydrocarbon charging area in the northwest of the northern slope of the Minfeng sub-sag,and it is a favorable hydrocarbon exploration target.What's more,the on-site carbon isotope rapid detection technology can provide a large number of continuous three-dimensional carbon isotope data,and it can be used to quickly analyze the characteristics of Studying hydrocarbon charging isquite important for searchingexploration targets and confirming well locations.In thispaper,the north slope of the hydrocarbon charging and determine the source and ori gin of hydrocarbon,so as to provide reference for hydrocarbon development deployment.展开更多
基金Project supported by the National Major Science and Technology Project"Key Technologies for Seismic and Wellbore Fine Exploration"(No.2016ZX05006-002)the RIPED Scientific Reseach and Technology Development Project"Real-time Carbon Isotope Detection and Gas-bearing Model"(No.2018ycq01).
文摘Minfeng sub-sag in the Bohai Bay Basin was taken as an example.The Wells Yanxie 233,Yongxie 932 and Yan 22 were selected for on-site carbon isotope detection.Then,based on sufficient carbon isotope datawhich were acquired on the drilling site using the brand-new carbon isotopic measuring instrument,the carbon i sotope dataand composition data of natural gas produced in this areawerecompared.Andcombined with the evolution of source rocks,the geochemical characteristics of crude oil,the depositional environment of reservoirs and the physical properties,single-well charging characteristics and regional charging area ofnatural gas wereanalyzed.Finally,the feasibility of on-sitecarbon isotope detection method to discriminate hydrocarbon charging was discussed.And the following research results were obtained.First,deep hy drocarbon charging happened in thePurely Purely Lower Sha 4 Member in Well Yanxie 233,and its natural gas is the mixture of the oil cracking gas of deep layers and the thernal cracking gas of autochthonous source rocks.Second,the natural gas in the third and fourth Members ofShahejieFormation in Well Yongxie 932 is the thermale racking gas of autochthonous source rocks,but deep gas charging occurred in particularhole sections.Third,the carbon isotope of associated gas in Well block Yan 22 is high in the central area and low in both sides and high in the south and low in the north,which is accordant with the distributi on characteristics ofreservoir physicalproperties,indicating thatthe charging ofhigh-maturity natural gas is under the control of reservoir physical properties.Fourth,the oil in Well block Yan 22 is the product of autochthonous source rocks in the mature stage while the natural gas is the autochthonous oil-associated gas combined with the charging of deep high-maturity product.It is concluded that there is a high-maturity hydrocarbon charging area in the northwest of the northern slope of the Minfeng sub-sag,and it is a favorable hydrocarbon exploration target.What's more,the on-site carbon isotope rapid detection technology can provide a large number of continuous three-dimensional carbon isotope data,and it can be used to quickly analyze the characteristics of Studying hydrocarbon charging isquite important for searchingexploration targets and confirming well locations.In thispaper,the north slope of the hydrocarbon charging and determine the source and ori gin of hydrocarbon,so as to provide reference for hydrocarbon development deployment.
