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Hydrocarbon-Source Correlation & Reservoir Formation and Evolution of Marine Strata in Jianghan Plain Area

Author: ZhuJianMin
Tutor: XuGuoSheng
School: Chengdu University of Technology
Course: Mineral prospecting and exploration
Keywords: Hydrocarbon source rock correlation The formation and evolution of oil and gas reservoirs Marine strata Jianghan Plain
CLC: P618.13
Type: Master's thesis
Year: 2010
Downloads: 101
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Abstract

Born in Jianghan Plain, reservoir and cap accumulation of basic conditions, marine strata in the vertical will be divided into five major oil and gas reservoir combinations. Through biomarkers geochemical characteristics determine the source of the marine strata filled with organic matter or asphalt. Easy% Ro dynamics simulation method to restore the Jianghan Plain marine strata typical structure of the main hydrocarbon source rocks thermal history and hydrocarbon generation history. And then combined with the tectonic evolution, analysis of the the Jianghan Plain marine strata typical structural reservoir formation and evolution process. Concluded the main controlling factors of hydrocarbon accumulation, pointing out that the favorable zones of oil and gas accumulation. The main results of the paper are as follows: (1) According to the Sinian - Jurassic reservoir, caprock development of the situation, in the longitudinal direction divided into five major oil and gas reservoir combinations were named I, II, III, IV , V combination. Well Da the Sinian the Doushantuo group - under Cambrian Tianhe board on up plays (Z2ds-∈ 1t), the Lower Cambrian Group - Middle Cambrian Tan family temple Tibetan combination (∈ 1T-∈ 2q ), Middle Cambrian Tan family temple group - Lower Silurian system Longmaxi composition plays for (∈ 2Q-S1lO), Upper Ordovician Wufeng Formation - Lower Permian Qixia combination of Tibetan (O2W the-P1q), the next two Permian Qixia Formation - Jurassic reservoir combinations (P1q-J). (2) Jianghan Plain Permian, Triassic oil seeps or reservoir filled with organic matter from the Permian source rocks; filling sources of organic matter in the Carboniferous and Devonian reservoirs of Silurian and Permian source rocks; the Silurian reservoir bitumen sources Silurian and Cambrian source rocks; asphalt from the Ordovician hydrocarbon source rocks. The oil seeps in the Jurassic coarse sandstone may come from under a volt Jurassic volts other strata or at least should not be from the Permian or strata. (3) Jianghan Plain area of ??the formation and evolution of marine stratigraphic reservoirs have gone through the following stages: (1) Late Indosinian formation occurs in the region of small-scale folds, oil and gas gathered in the paleouplift area. (2) early Yanshan period, extrusion the uplift area marine strata depth of significantly lighter and even outcrop. Even the exposed surface of Lower Paleozoic in some areas to varying degrees, the marine stratigraphic reservoirs suffered severe damage. Middle Triassic to Jurassic regional cap erosion thickness smaller areas, the marine strata storage conditions is still very good. The ③ late Yanshan period - early Himalayan period, the regional extensional stress areas, the fault is in the open state, generated from source rocks in the oil and gas and ancient hydrocarbon reservoirs of oil and gas along the fault surface dissipation, ancient marine strata in oil and gas reservoirs fatally damage; (4) Late Himalayan period so far, no major tectonic movement and fracture occurs the marine strata archive gradual improvement in performance, but each hydrocarbon source rocks in oil and gas peak has already passed, no secondary hydrocarbon generation capacity. (4) the main controlling factors of hydrocarbon accumulation: ① tectonic uplift denudation, mainly refers to the strong folds of Yanshan uplift, denudation. Extrusion uplift of the area of ??marine strata depth of significantly lighter and even outcrop, and even some areas Lower Paleozoic varying degrees of exposure to the surface, the marine stratigraphic reservoirs destruction; (2) breaking activities the Indosinian fracture oil and gas the destructive effects are relatively small. The Yanshanian breaking parts of the formation and greatly suffered erosion and atmospheric water leaching out of the surface. Late Yanshan period - as early Himalayan period fracture tensile fracture, the fracture was open, positive development of faults, causing fatal damage to the ancient oil and gas reservoirs; (3) hydrocarbon accumulation in space-time configuration mismatch, mainly referring to the Carboniferous - Lower Triassic petroleum system. The main source rocks of Silurian and Permian in the late Yanshan - early Himalayan period is angry, peak oil generation stage, Jianghan Plain as a whole is in a tensional environment, the fracture was open, poor preservation conditions of oil and gas generated from source rocks of oil and gas can not be gathered in the effective trap, only to escape to the surface along the fault. (5) Yichang stability zone in northern Dahongshan arc tectonic zone, southern Bamianshan - the big moshan arc structure Zone and the West huangling uplift common confining a constructor V-belt due to the tripartite confining the area by hedge compression is weak, stable structure, fold relief, fracture development, mainly the Indosinian since the overall lifting movement, marine strata of Jianghan Plain favorable exploration blocks.

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