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桂中坳陷泥盆纪生物礁滩发育,桂中1井钻探证实该区存在优质生物礁灰岩和白云岩储层。野外露头、显微照片和扫描电镜等分析测试手段表明,该区泥盆纪生物礁储集空间主要包括孔隙、裂缝和溶洞。孔隙类型有粒内溶孔、骨架孔、粒间孔、溶孔、缝合线伴生溶孔等,以晶间溶孔、晶间孔及非组构控制的溶蚀孔、洞、缝为主,储层类型主要为裂缝型、裂缝-孔隙型和孔隙型。沉积环境、成岩作用及构造裂缝控制有利储层的发育,现今储集空间以埋藏溶蚀孔隙和保留下来的残余孔、洞、缝为主。地球化学和成岩作用研究表明,储层孔隙演化与油气充注密切相关,可能发生两期油气充注。储层焦沥青的形成主要是由于地层深埋造成原油热裂解。因此,该区油气勘探应以原油裂解天然气为主,寻找具有保存条件的岩性体。
The development of the Devonian reef beach in the central Guangxi depression and the drilling of the well Guizhong 1 confirmed that there are high-quality reef limestone and dolomite reservoirs in this area. The analysis of outcrops, micrographs and SEM shows that the Devonian reef reservoirs in the area mainly include pores, cracks and caves. Pore types are intragranular dissolved pores, skeleton pores, intergranular pores, dissolved pores, suture associated dissolved pores and so on, with intergranular dissolved pores, intergranular pores and non-structural controlled dissolution pores, holes and seams, storage The main types of fractures are fractures, fractures-pores and pores. Depositional environment, diagenesis and tectonic fractures control the development of favorable reservoirs. Nowadays, reservoir space is mainly composed of buried dissolution pores and residual pores, holes and seams. Geochemical and diagenetic studies show that the evolution of reservoir porosity is closely related to hydrocarbon filling, and two phases of hydrocarbon filling may occur. The formation of pyrophyllite in reservoirs is mainly due to the thermal cracking of crude oil caused by the deep formation. Therefore, oil and gas exploration in this area should be based on crude oil pyrolysis of natural gas, looking for the preservation of lithological body.