CAJ | 학술논문

早石炭亚纪冰川性海平面变化及黔桂盆地独特的古地理位置控制着盆地中的地球生物学过程,决定了生烃母质生物的生产力和有机质的保存条件,进而影响了盆地相烃源岩的形成与分布.通过对广西巴平剖面地球生物相分析,探讨下石炭亚系盆地相烃源岩形成的地球生物学过程,结果表明:汤粑沟期早期、旧司期中晚期生境型以VI_b(台间深海盆地生境相)为主,盆地中生产力水平较低,但盆地中水体较深,古氧相为厌氧相,有机质埋藏效率高,形成了下石炭亚系的优质烃源岩.汤粑沟中期生境型为VI_b,生产力水平低,古氧相为贫氧相-厌氧相,由于沉积速率过慢,发生了大量的Mn/Fe氧化还原反应,降低了有机质的埋藏效率,仅形成了一套非烃源岩.早旧司期及上司期生境型为IV_1(范围为风暴浪基面至真光层下界面)、IV_2(范围为真光层下界面至大陆架坡折处),生产力水平低一中,古氧相为准厌氧相-贫氧相,形成了一套非烃源岩-一般烃源岩.上司期末期-罗苏期生境型主要为III_2(范围为强光合作用面至风暴浪基面),局部为IV_1,生产力水平中-高,古氧相为常氧相-贫氧相,有机质埋藏效率低,形成了一套非烃源岩-差烃源岩.
조석탄아기빙천성해평면변화급검계분지독특적고지리위치공제착분지중적지구생물학과정,결정료생경모질생물적생산력화유궤질적보존조건,진이영향료분지상경원암적형성여분포.통과대엄서파평부면지구생물상분석,탐토하석탄아계분지상경원암형성적지구생물학과정,결과표명:탕파구기조기、구사기중만기생경형이VI_b(태간심해분지생경상)위주,분지중생산력수평교저,단분지중수체교심,고양상위염양상,유궤질매장효솔고,형성료하석탄아계적우질경원암.탕파구중기생경형위VI_b,생산력수평저,고양상위빈양상-염양상,유우침적속솔과만,발생료대량적Mn/Fe양화환원반응,강저료유궤질적매장효솔,부형성료일투비경원암.조구사기급상사기생경형위IV_1(범위위풍폭랑기면지진광층하계면)、IV_2(범위위진광층하계면지대륙가파절처),생산력수평저일중,고양상위준염양상-빈양상,형성료일투비경원암-일반경원암.상사기말기-라소기생경형주요위III_2(범위위강광합작용면지풍폭랑기면),국부위IV_1,생산력수평중-고,고양상위상양상-빈양상,유궤질매장효솔저,형성료일투비경원암-차경원암.
During the Early Carboniferous, glacio-eustasy and the palaeogeographic environment of Qiangui intra-platform basin played crucial roles in controlling the geobiological processes, the formation and distribution of basinal facies hydrocarbon source rocks. Analyses of biogeological facies from Baping section deposited in Qiangui basin in Guangxi, enable us to explore the geobiological processes of the formation of basinal facies hydrocarbon source rocks. The results show that: during the Early Tangbagouan and Middle-Late Jiusian, the Qiangui basin was mainly characterized by habitat type VI_b, low productivity and anaerobic facies. A set of premium hydrocarbon source rocks formed during this period were attributed to the high burial efficiency of organic matter; during the Middle Tangbagouan, the Qiangui basin was characterized by habitat type VI_b, low productivity and dysaerobic-anaerobic facies. A set of non-hydrocarbon source rocks were formed due to the slow sedimentation rate, abundant Mn/Fe redox reaction;during the Early Jiusian and Shangsian, the Qiangui basin was characterized IV_1-IV_2, low-middle productivity and quasi-anaerobic-dysaerobic facies. A set of non-hydrocarbon source rocks-hydrocarbon source rocks were formed during this period; during the Late Shangsian and Luosu, the Qiangui basin was characterized by habitat type III_2-IV_1,middle-high productivity and dysaeobic-aerobic facies, A set of nonhydrocarbon source rocks were formed by the low burial rate of organic matter.