D型菌解无定形体的形成及其生烃模式  

THE FORMATION 0F TYPE - D BACTERIDECOMPAMO- RPHINITE AND ITS HYDROCARBON GENER ATING PATTERN

作　　者：丁安娜[1] 惠荣耀[1] 夏燕青[1] 

机构地区：[1]中国科学院兰州地质研究所

出　　处：《地质科学》1997年第2期221-228,T001,共9页Chinese Journal of Geology(Scientia Geologica Sinica)

摘　　要：通过对准噶尔盆地部分油藏烃源岩的电子显微镜研究，在大量样品中检出Ｄ型菌解无定形体，其母质来源具有二元混合性，形成在弱还原─原环境中，生烃门限Ｒ值为０．４％，生烃期大约为０．４％－０．７％，是轻质油（或凝析油）和天然气形成的重要组分之一。在低演化阶段，由于细菌参加了对有机质的改造，使Ⅱ－Ⅲ类烃源岩中富集氢，生烃能力变好。文章还初步探讨了芳烃化合物含量与菌解无定形体Ｄ形成的关系，指出当沉积体系中的硫和硫化氢与铁结合，形成稳定的黄铁矿物后，才有可能在Ⅲ型有机质中形成高含量的Ｄ型菌解无定形体。This paper provides new evidenoe foc fact that baderia parddpate in the tnnsfonnadon of organic matter at the carly evoludonary stage. A large amouat of type - D bacteridecompamorphinite were found in kerogens of soume rocks in part of oil resewoin of Junggar basin. Studia oa the compoddon of biogenetic soume and formadon environmeat fbr Qpe D bactdeompaznorphinite, and its hydrocarbon - genemdng potar tial etc. show that samples rich in that samples richmpamorphinite from Junggar basin arematblyialatolDrangeintheWpefagureofod-genemdngrockaoordiagto.Tvalues and IindexdMdon Its original have mized characteristics of both terrestrial higher plant and aguaic orgaisms from fresh water and it might be formed in the environment from weak to usual reduction It is sugge. that bacteridecompamorphir-D occures in lhe lower evoludonary. stage. lts th.hold of hydrocarbon produdion, R. value, is about 0.4% , and for most samples in the bydrocarboa - geaendag pedod 0.4% - 0.7%. When R. value reaches 0.8%, hydrocarbon drain off generally cnds. The hade ridecompamorphinite-D is one of major materials of forminglight oil(or oondensak) and natural gas in the low maturity stage. Bactaia reform of the organic matter inaeases hydrogen coatmt in type Ⅱ toⅢ soume rocks, hydrocarbon - genera.ng potential. Type D backntdeoznpamorphinite is not the bat, as compamd to A, B, C, but better than none. ln thc soume rock, the amount of bacteridecompamorphinite is contmled by the con- teat of aromatic coompounds,beause they have toxidty for bacteeria.For example,the amount of D type bacteridecompamorphinite decrases with the iaaeas of the dilxarootHopheae compound, therefore, the author tMnks that a large amouat of dibenzothiptMophene and other ammada are easily formed when Mgher plaot bearing richxylem is decomposed in the type Ⅲorganic matter Only when Sulphur and hydrogen sulphide in the deposit system combine with iron to from pyrite mineralswhich are stablecan a largy amouot of bacteridecompamorphinite be formed .

关 键 词：菌解无定形体 油气形成 油气藏 生烃模式 盆地 

分 类 号：P618.130.1[天文地球—矿床学] P618.130.2[天文地球—地质学]