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Theoretical and technical progress in exploration practice of the deep-water large oil fields, santos basin, Brazil

Petroleum Exploration and Development 2023年第2期50卷 255-267页

作者： HE Wenyuan SHI Buqing FAN Guozhang WANG Wangquan WANG Hongping WANG Jingchun ZUO Guoping WANG Chaofeng YANG Liu China National Oil and Gas Exploration and Development Corporation Beijing 100034China PetroChina Hangzhou Research Institute of Geology Hangzhou 310023China

The history and results of petroleum exploration in the santos basin, Brazil are reviewed. The regularity of hydrocarbon enrichment and the key exploration technologies are summarized and analyzed using the seismic, gravity, magnetic and drilling data. It is proposed that the santos basin had a structural pattern of two uplifts and three depressions and the Aram-Uirapuru uplift belt controlled the hydrocarbon accumulation. It is believed that the main hydrocarbon source kitchen in the rift period controlled the hydrocarbon-enriched zones, paleo-structures controlled the scale and quality of lacustrine carbonate reservoirs, and continuous thick salt rocks controlled the hydrocarbon formation and preservation. The process and mechanism of reservoirs being transformed by CO_(2)charging were revealed. Five key exploration technologies were developed,including the variable-velocity mapping for layer-controlled facies-controlled pre-salt structures, the prediction of lacustrine carbonate reservoirs, the prediction of intrusive/effusive rock distribution, the detection of hydrocarbons in lacustrine carbonates, and the logging identification of supercritical CO_(2)fluid. These theoretical recognitions and exploration technologies have contributed to the discovery of deep-water super-large reservoirs under CNODC projects in Brazil, and will guide the further exploration of deep-water large reservoirs in the santos basin and other similar regions.

关键词： lacustrine carbonates salt rock deep-water oilfield igneous rock identification reservoir prediction hydrocar-bon detection supercritical CO_(2) santos basin Brazil

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Hydrocarbons in igneous rock of Brazil:A review

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Petroleum Research 2020年第3期5卷 265-275页

作者： Kangxu Ren Junfeng Zhao Qian Liu Jian Zhao CNODC Brasil Petroleo e Gas Ltda Rio de Janeiro22250-040Brazil PetroChina Research Institute of Petroleum Exploration&Development Beijing100083China

Igneous rocks are widely developed in many hydrocarbon-bearing sedimentary basins in Brazil,and some igneous rocks play positive roles in the oil and gas accumulation *** so far,no industrial oil or gas flow is discovered in igneous rocks in Brazilian onshore *** present,in some literatures published by some researchers,cases of igneous reservoirs in Brazil are *** lithology of reservoirs in the Igarape Cuia oil and gas field,the oil and gas field of Urucu and the Barra Bonita gasfield,were previously thought to be volcanic rocks,but now are clastic rocks according to studies,and the igneous rocks in these three oil and gas field can only be acted as indirect and direct cap ***,igneous rock reservoirs in the Campos basin and santos basin in the Brazilian offshore are briefly *** representative Badejo oilfield in the Campos basin has igneous rock reservoirs dominated by basalts which are intercalated with thin layers of volcaniclastic and sedimentary rocks,the storage space are vesicules,fractures and vugular pores,and the porosity of hydrocarbon bearing interval basalt reservoirs ranges from 10%to 15%.In addition,for the santos basin,igneous rocks in this basin are dominated by basic rocks,some alkaline intrusive rocks develop good micro spaces,mainly crystal moldic pores,inter-and intra-crystal dissolution pores and fractures,better reservoir intervals are often concentrated such as at sections near to unconformity surfaces and can have porosity of 6%e9%or higher;local pre-salt igneous rock reservoirs in the santos basin have the necessary conditions for hydrocarbon accumulation and it will be a new target layer for hydrocarbon exploration.

关键词： Igneous reservoirs Badejo oilfield Pre-salt igneous rocks Offshore Campos basin santos basin Brazil

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Controls of fracturing on porosity in pre-salt carbonate reservoirs

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Energy Geoscience 2023年第2期4卷 49-61页

作者： Wagner Moreira Lupinacci Tuany Younis Abdul Fatah Maria Cordeiro do Carmo Antonio Fernando Menezes Freire Luiz Antonio Pierantoni Gamboa Exploratory Interpretation and Reservoir Characterization Group(GIECAR) Department of Geology and GeophysicsUniversidade Federal FluminenseNiteróiRio de Janeiro24210346Brazil National Institute of Science and Technology of Petroleum Geophysics(INCT-GP/CNPQ) NiteróiRio de Janeiro24210346Brazil

This work aims to improve the understanding of how fracture zones affect carbonate reservoir properties based on observations of a pre-salt well located in the santos basin,*** identification of fracture zones allowed for the observation of a relationship between the occurrence of rock fractures and the silicification,as the latter plays an important role in determining porosity(higher silica content may increase brittleness of the rocks therefore increasing the likelihood of creating fractures zones and fractures may be filled up reducing the total porosity).To support the proposed observation,an integrated study was conducted using borehole imaging,spectroscopy logs,and sidewall core *** porosities were defined using nuclear magnetic resonance log analysis,alongside sidewall core samples,and thin *** integration of rock samples and well data with seismic analysis was performed to analyze the presence of a regional fault system that could explain high fracture densities as well as observed silica content *** results show how different types of cement filling up the formation pores affect fracture densities and total ***,it was possible to infer that the amount of silica content observed in well logs and thin sections relates to hydrothermal fluids reaching out the reservoir through regional fault systems detected in the seismic ***,this paper supports the comprehension of how diagenetic processes can significantly affect the properties of presalt reservoirs.

关键词： Fracture Porosity Pre-salt carbonatereservoir santos basin

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