| Block D is located in the west of Mandalay which is the second largest city in central Myanmar. Now, exploration into the block is low in general, and distribution of effective source rocks has not been determined, and subsequent exploration reveals fast changes in the reservoir block,it shows that Block D exists complexity of exploration prospects. Therefore, Research on geological conditions of oil and gas of the area contributes to provide the scientific basis for the deployment of further exploration.Based on the regional geological setting and geological evolution ,this paper absorbs fully previous results and understanding and neighborhood survey data, on the basis of accumulation conditions,focusing on the basic geological reservoir formation elements in the study area (effective source rocks , reservoir, seal, reservoir) and accumulation effect of the process (trap formation, hydrocarbon generation, migration, accumulation, etc.) which has a good relationship between time and space configuration. By the analysis, summary and research of petroleum geological features representation(organic carbon,microscopically analysis of kerogen,mirror coal reflectivity,etc), using a new theory of modern petroleum geology, we combine static and dynamic research ideas to indicate geological conditions of oil and gas , and the controlling factors affecting the accumulation of the area, providing a reliable geological basis for the deployment of favorable exploration area .The focus of the study is the Eocene formation, Block D exists three possible source rocks: hydrocarbon source rocks of Kabaw formation are shallow water phase gray, dark gray - dark gray mudstone, shale ; Langxin formation are gray-black, dark gray mudstone and shale; the upper part of Tabyin formation is a set of source rocks, coal and gray mudstone source rocks ,the lower part are shale hydrocarbon source rocks , According to analysis of organic carbon index ,abundance of organic matter is generally high, up to medium or medium level and above, mirror coal reflectivity as mMaturity analysis index that organic matter is in low maturity - maturity period. Currently three sets of reservoir are found: Pondaung formation,Tilin formation and Tabyin formation. Aanlysis of data from cores ,flakes,casting and electron microscopy diplay that sand-strata ratio of the three reservoir sands is high, a large total accumulated reservoir thickness of the main reservoir section .Although belonging to the low porosity - low permeability reservoir, some layers have a high porosity reservoir development. According to drilling shows that Pondaung formation,Tilin formation and Tabyin formation have a large total accumulated reservoir thickness with certain sealing capacity. They can be used as good local seals; And sedimentary facies equivalent by a comprehensive study shows that in this area have developed regional Natema group of miocene and Yao he group of eocene as regional seals. Patolon tectonic belt and Muhuduang tectonic belt develop stable cover layer, according to the structure ,it exists many sets of soure-reservior-roof.Study area develops nose and anticline trap, weak deformation zones of eastern area develop lithologic trap. The control of oil and gas distribution by main faults of the area mainly reflects in two aspects: First, transformation of primary hydrocarbon accumulation and the establishment of new oil and gas gathering places such as the structural trap, the second is that providing the main channel for the migration of deep oil and gas. Examples of Lepanto oilfield show that unconformity to the injection migration section is crucial Block D.For eocene stratum of Block D, we analyze the basic geological conditions of accumulation in oil and gas source, clarify the oil and gas sources and the hydrocarbon reservoir types, analyze the development of traps and hydrocarbon accumulation ,and effect of Structure and Evolution. Combined with the example analysis of exploration, main controlling factors of accumulation in Block D are researched. Study found that the superposition of source rocks, tectonic movement, the direction of oil migration, reservoir development is the D block matching cap accumulation controlling factors. |
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